Adobe is currently investigating a new security hole in Reader and Acrobat. Cybercriminals are currently spamming emails with prepared documents which lead to an infection of the computer with malware.

The PDF document abuses a buffer overflow in a new place within the Adobe programs. There is a JavaScript object included in the PDF which checks the Reader Version – the exploit works with Adobe Reader starting at version 8. The code it injects downloads malware which it stores in the file “winver32.exe” in the Windows directory. This file drops 3 further files which Avira detects as BDS/Ientlcp.A, TR/Agent.faa and TR/Agent.HO.

Anyhow users are best advised to not open PDF files they receive unexpectedly until Adobe provides Updates for Reader and Acrobat.

Note From Adobe:

This afternoon, Adobe received reports of a vulnerability in Adobe Reader and Acrobat 9.2 and earlier versions being exploited in the wild (CVE-2009-4324). We are currently investigating this issue and assessing the risk to our customers. We will provide an update as soon as we have more information.