The files parsing engine in Grisoft AVG Anti-Virus before 8.0.156 allows remote attackers to cause a denial of service (engine crash) via a crafted UPX compressed file, which triggers a divide-by-zero error.
https://exchange.xforce.ibmcloud.com/vulnerabilities/44057
http://www.vupen.com/english/advisories/2008/2225/references
http://www.securitytracker.com/id?1020570
http://www.securityfocus.com/bid/30417
http://www.securityfocus.com/archive/1/494867/100/0/threaded