Foxit Reader, Enterprise Reader, and PhantomPDF before 7.1.5 allow remote attackers to cause a denial of service (memory corruption and crash) via vectors related to digital signatures.
http://www.securitytracker.com/id/1032228
http://www.securityfocus.com/bid/74418
http://www.foxitsoftware.com/support/security_bulletins.php#FRD-26