Exploit:Win32/Pdfjsc is a threat identified by Microsoft Security Software. This is typical malware that targets the core system of Windows in order to complete its tasks. Exploit:Win32/Pdfjsc was made to execute a series of commands once it got inside the system. It will gather data like system settings, Windows version, network configuration, and so on. The collected data will be sent to a remote attacker for analysis.

In general, Exploit:Win32/Pdfjsc Trojan refers to malicious software embedded within a PDF file, exploiting vulnerabilities to compromise the security of a computer system. When a user opens the infected PDF, the Trojan can execute various harmful actions, such as installing malware, stealing sensitive information, or facilitating unauthorized access. Computer users should exercise caution when opening PDFs from untrusted sources to prevent falling victim to such cyber threats.

Illustration of Exploit:Win32/Pdfjsc

Threat behavior

The operating system will get infected with Exploit:Win32/Pdfjsc if malicious code is executed on the computer. The source of this Trojan may vary due to the changing ways in which it is deployed. Typically, spam email messages disguised as open letters from reputable institutions are used to deceive recipients. The body of the message contains enticing phrases that try to convince the user to open the attached file.

Malicious links from social media sites and instant messaging programs are also seen as methods used in distributing Exploit:Win32/Pdfjsc. Illegally distributed software and media materials may also contain code that can lead to the infection of this malware.

How does this malware operate?

In order to run itself on Windows start-up, Exploit:Win32/Pdfjsc will make a copy of itself under system files. Then, a registry entry is created to call the file on each Windows boot. Apart from that, this malware will also drop non-malicious files in various folders of the compromised PC.

Exploit:Win32/Pdfjsc occasionally connects to a remote host to execute tasks like the following:

  • Notify the attacker of the new infection.
  • Sends gathered data from the infected computer.
  • Download and execute additional files, including an updated version of the Trojan.
  • Accept a command from a remote attacker.


The signs of an Exploit:Win32/Pdfjsc infection can appear in several ways. Initially, users may notice odd behavior in their PDF reader, such as slower performance, unexpected crashes, or unresponsiveness. Additionally, Exploit:Win32/Pdfjsc may abuse weaknesses in the user’s system, leading to the installation of other malware, which can result in further disruptions, such as system slowdowns, frequent pop-ups, or changes to browser settings.

Furthermore, Exploit:Win32/Pdfjsc often aims to damage user privacy, leading to illegal access and the loss of private information. This may include personal passwords, banking data, or other private details saved on the affected gadget. As a safe step, users should regularly update their software, employ reputable security tools, and practice care when reading PDF files, especially those received from unknown or unverified sources.

Versions of Exploit:Win32/Pdfjsc
Version Name Alert Level Date Added
Exploit:Win32/Pdfjsc.Q Severe Jan. 22, 2024
Exploit:Win32/Pdfjsc.ALC Severe Mar. 26, 2015
Exploit:Win32/Pdfjsc is also detected as:
Avast JS:Pdfka-gen [Expl]
Avira EXP/Pidief.eel
BitDefender PDF:Exploit.PDF-JS.UL
DrWeb Exploit.PDF.3199
F-Secure Exploit:JS/Pdfka.TI
F-Prot JS/Pdfka.JB
Fortinet JS/Pdfka.QCF!exploit
Kaspersky HEUR:Exploit.Script.Generic
McAfee PDF/Blacole-FCX!EF4C398C0138
Sophos Troj/PDFEx-GX

For more help

Exploit:Win32/Pdfjsc threat family has disclosed various threats to the public. To access similar threats and effective removal methods, refer to the Trojan category.

How to remove Exploit:Win32/Pdfjsc.ALC?

To totally remove Exploit:Win32/Pdfjsc.ALC from the computer and get rid of relevant viruses and trojans, please execute the procedures as stated on this page. Make sure that you have completely scanned the system with the suggested malware removal tools and virus scanners.

Quick Fix - Scan the PC with Combo Cleaner for Windows

Combo Cleaner is a trusted PC security and optimization tool equipped with a powerful virus and malware detection engine. This program can get rid of hazardous viruses like Exploit:Win32/Pdfjsc.ALC through this procedure.

1. Download the application from the following page:

2. Save the file to your preferred location.

3. Double-click the downloaded file CCSetup.exe and install with the default settings.

CC for Windows Installation

4. At the end of the setup process, click Finish to run Combo Cleaner.

5. The tool will update the signature file, please wait for this process to complete.

6. To begin checking for threats like Exploit:Win32/Pdfjsc.ALC, click on the Start Scan button. Wait for this scan to finish.

CC for Windows Start Scan

7. At the end of the scan process, click on Remove all threats to delete the Exploit:Win32/Pdfjsc.ALC virus, including all malicious objects from the computer.

Free features of Combo Cleaner for Windows include Disk Cleaner, Big Files finder, Duplicate files finder, and Uninstaller. To use antivirus, privacy scanner, and to delete identified threats, users have to upgrade to a premium version.

Please continue with the succeeding removal procedures if you are comfortable manually getting rid of the virus and malicious items linked to it.

Step 1 : Start Windows in Safe Mode With Networking

Windows 10 / 11 Guide

1. Click on the Windows logo and select the Power icon when options pop up.
2. Select Restart from the options while pressing the Shift key on the keyboard.
3. Choose an Option window will appear. Select the Troubleshoot button.
4. In next window, please choose the Advanced Option.
5. On the Advanced Option window, click on Startup Settings, and then, click the Restart button to reboot the computer.
6. When Windows boots in Startup Settings, press the function key F5 or number 5 on the keyboard.

A simpler alternative for Windows 10 users is to scan the computer with Microsoft Defender Offline. This will run a virus scan in the recovery environment.

Windows 8 Guide

1. Click the Windows Start icon in the lower left section of the screen.
2. Open the Search window and type Advanced in the field. It will open General PC Settings.
3. Click on Advanced Startup, and then click on the Restart Now button.
4. Once the computer starts in the Advanced Startup option menu, select Troubleshoot.
5. Next, click on Advanced Options to reveal the next section.
6. Click Startup settings, and then click the Restart button to boot the PC in Startup Settings.
7. Use function key F5 or number key 5 to Enable Safe Mode with Networking.

Step 2 : Run a virus scanner

To remove Exploit:Win32/Pdfjsc.ALC, we suggest that you scan the infected computer with this powerful virus removal tool. It can detect and get rid of Trojans, viruses, malware, and adware from the infected computer. To fully protect the computer against Exploit:Win32/Pdfjsc.ALC or similar attacks, you can activate Sophos to have real-time scanning and complete defense against all forms of threats.

1. Download Sophos Virus Removal Tool from the link below. Save the file on your computer where you can easily access it.

2. Once the download completes, browse the location of the file. Double-click to run the program and begin the install process.

3. On the first window of installation wizard, click Next to continue. Then, it will display the program’s License Agreement. You need to Accept the terms in order to proceed. If Windows prompts for User Account Control, please click Yes to proceed.

Screenshot of Sophos EULA Page

4. On succeeding windows, click Next or Continue to carry on with the installation. After completing the installation process, Launch Sophos Virus Removal Tool.

5. An internet connection is required when running this scanner in order to download important updates. Make sure that everything is up-to-date to effectively remove viruses like Exploit:Win32/Pdfjsc.ALC.

6. Click the Start Scanning button to  carry out the Scan. This will check the system for the presence of malicious objects, malware, and viruses. The tool reveals items that were found linked to Exploit:Win32/Pdfjsc.ALC and other suspicious entities. Be sure to remove all identified threats.

Screenshot of Sophos Virus Scan

After executing the above instructions, Exploit:Win32/Pdfjsc.ALC should have been completely removed from the computer. If there are still signs of infection or the computer is displaying unusual behaviors, please continue with the remaining procedures.

Step 3 : Double Check with Windows Security Apps

Microsoft Windows has a built-in security application that you can use to double-check if your computer is still infected with Exploit:Win32/Pdfjsc.ALC. For Windows 8 and 10/11 users, please run Windows Security. Users of Windows Vista and older versions can utilize Microsoft Security Essentials to remove the Exploit:Win32/Pdfjsc.ALC virus.

Windows 8 / 10 / 11 Instructions:

Windows Security is a free tool that was built to help you remove Exploit:Win32/Pdfjsc.ALC, viruses, and other malicious items from Windows 8 or Windows 10/11 systems. Follow these procedures to scan your computer with the tool:

1. Tap or click the Search charm, search for Windows Security, and then open the application.

Image of Windows Security Search

2. On the Home tab, click Virus and threat protection from the sidebar.

3. On the main window, click on Scan Options. Then, click on Full Scan button.

Image of Scan Options

4. Lastly, click on the Scan now button to start scanning for the presence of Exploit:Win32/Pdfjsc.ALC. The process may take a while to complete.

5. After the scan, Delete/Quarantine identified threats, whether they were relevant to Exploit:Win32/Pdfjsc.ALC or not. You may now restart Windows to complete the virus removal process.

How to protect the computer from Exploit:Win32/Pdfjsc.ALC?

The initial defense that comes to mind for any computer user is to install an anti-virus or anti-malware program. This move is sensible and probably the most practical way to protect the computer against a Exploit:Win32/Pdfjsc.ALC attack. Hence, keep in mind that having security software does not guarantee full protection. The majority of the prevention still lies in being cautious of users, and therefore, we are providing the following information as guidelines to protect the computer from virus infection.

Avoid Malicious Websites

There are enormous numbers of websites that were made for the primary purpose of spreading Exploit:Win32/Pdfjsc.ALC. Normally, these sites are involved in integrating malicious pop-up and browser hijacker, that will eventually cause further virus infections. Avoid such websites.

Ignore and Delete Phishing Emails

The mass-mailing of computer viruses gives the attackers the luxury of spreading their malicious code in just one send-off. This will arrive in the inbox as an email that appears to be from a legitimate organization. So, if you receive an unexpected email with a link or an attached file, better delete it immediately.

Do Not Click a Suspicious Link

Links from social media, forums, and blog sites are sometimes being utilized by attackers to drive web users to a malicious page that contains malicious code. Therefore, do not just click on any link, especially if it looks suspicious. Accidental access to the destination site may lead to a Exploit:Win32/Pdfjsc.ALC infection.

Be Careful When Downloading Files

Cracked software, serial key generators, and several freeware are seen as another method that spreads the Exploit:Win32/Pdfjsc.ALC virus. Avoid acquiring these types of applications, and if there is a need to download freeware or shareware, be sure to obtain it from the official website or trusted providers.

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