The OLE2 parser in Clam AntiVirus (ClamAV) allows remote attackers to cause a denial of service (resource consumption) via an OLE2 file with (1) a large property size or (2) a loop in the FAT file block chain that triggers an infinite loop, as demonstrated via a crafted DOC file.
http://www.vupen.com/english/advisories/2007/1776
http://www.securityfocus.com/bid/24316
http://www.novell.com/linux/security/advisories/2007_33_clamav.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:115
http://www.debian.org/security/2007/dsa-1320
http://security.gentoo.org/glsa/glsa-200706-05.xml
http://secunia.com/advisories/25796
http://secunia.com/advisories/25688
http://secunia.com/advisories/25558
http://secunia.com/advisories/25553
http://secunia.com/advisories/25525