Unspecified vulnerability in the U3D component in Adobe Reader and Acrobat 10.1.1 and earlier on Windows and Mac OS X, and Adobe Reader 9.x through 9.4.6 on UNIX, allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via unknown vectors, as exploited in the wild in December 2011.
http://www.us-cert.gov/cas/techalerts/TA11-350A.html
http://www.adobe.com/support/security/bulletins/apsb12-01.html
http://www.adobe.com/support/security/bulletins/apsb11-30.html
http://www.adobe.com/support/security/advisories/apsa11-04.html