Exploit:Win32/Pdfjsc.AV is the detection for a PDF file that exploits several PDF (Portable Document Format) vulnerabilities. It runs another malware that connects to a remote Web site, possibly to download other malware.

Exploit:Win32/Pdfjsc.AS is a detection for specially-crafted PDF files that attempt to exploit software vulnerabilities in Adobe Acrobat and Adobe Reader. It usually arrives in the system when the user visits a Web page that contains a malicious PDF file or opens an e-mail message containing the PDF file as an attachment.

Windows Defender detects and removes this threat.

This threat uses a vulnerability in some Adobe products to download and run files on your PC, including other malware.

It can run if you have a vulnerable version of Adobe on your PC and you visit a malicious website, or open a malicious PDF document attached to an email.

The following versions of Adobe Reader and Acrobat are vulnerable:

• 9.x before 9.5.5
• 10.x before 10.1.7
• 11.x before 11.0.03

You may get an alert about this threat even if you're not using a vulnerable software version. This is because we detect when an attempt is made to exploit this vulnerability, even if it isn't successful.

You can find more information about this threat on the CVE website or our page about exploits.