Apple Type Services (ATS) in Apple Mac OS X 10.5 before 10.5.6 allows remote attackers to cause a denial of service (infinite loop) via a crafted embedded font in a PDF file.
http://www.vupen.com/english/advisories/2008/3444
http://www.us-cert.gov/cas/techalerts/TA08-350A.html
http://www.securityfocus.com/bid/32875
http://www.securityfocus.com/bid/32839
http://support.apple.com/kb/HT3338
http://securitytracker.com/id?1021398
http://secunia.com/advisories/33179
http://lists.apple.com/archives/security-announce//2008//Dec/msg00000.html