CVE 2011-2105
Adobe Reader and Acrobat 8.x before 8.3, 9.x before 9.4.5, and 10.x before 10.1 on Windows and Mac OS X allow attackers to cause a denial of service (memory corruption) or possibly have unspecified other impact via crafted font data.
See the 
CVE page on Mitre.org
for more details.
