Security Advisory for Adobe Reader and Acrobat
On February 13, 2013, Adobe announced security issues with Adobe Reader and Acrobat. The vulnerabilities can permit an attacker to take control of unprotected computers when users click on PDF files delivered via email.
See https://www.adobe.com/support/security/advisories/apsa13-02.html for the list of affected Adobe products and the steps you can take to protect your computer.