Integer overflow in the Microsoft Malware Protection Engine (mpengine.dll), as used by Windows Live OneCare, Antigen, Defender, and Forefront Security, allows user-assisted remote attackers to execute arbitrary code via a crafted PDF file.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-010
http://www.vupen.com/english/advisories/2007/0579
http://www.us-cert.gov/cas/techalerts/TA07-044A.html
http://www.securitytracker.com/id?1017636
http://www.securityfocus.com/bid/22479