“Everybody” uses PDFs, right?
A Security Advisory has been posted in regards to the Adobe Reader and Acrobat issue discussed in the Adobe PSIRT blog on December 14 “New Adobe Reader and Acrobat Vulnerability,” CVE-2009-4324. A critical vulnerability exists in Adobe Reader and Acrobat 9.2 and earlier for Windows, Macintosh and UNIX operating systems. This vulnerability CVE-2009-4324 could cause a crash and potentially allow an attacker to take control of the affected system. There are reports that this vulnerability is being actively exploited in the wild. Customers should refer to the Security Advisory for information on mitigating this vulnerability. The advisory will be updated once a schedule has been determined for releasing a fix.
More here: Adobe Product Security Incident Response Team PSIRT