Foxit Reader before 5.3 on Windows XP and Windows 7 allows remote attackers to execute arbitrary code via a PDF document with a crafted attachment that triggers calculation of a negative number during processing of cross references.
http://www.securityfocus.com/bid/55150
http://www.foxitsoftware.com/Secure_PDF_Reader/security_bulletins.php
http://technet.microsoft.com/security/msvr/msvr12-013