QuickLook in Apple iOS before 9.2 and OS X before 10.11.2 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted iWork file.
https://support.apple.com/HT205637
https://support.apple.com/HT205635
http://www.securitytracker.com/id/1034344
http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
http://lists.apple.com/archives/security-announce/2015/Dec/msg00000.html