Adobe Reader (formerly Adobe Acrobat Reader) is a closed-source PDF reader.
Multiple vulnerabilities were discovered in Adobe Reader. For further information please consult the CVE entries and the Adobe Security Bulletin referenced below.
A remote attacker might entice a user to open a specially crafted PDF file, possibly resulting in the execution of arbitrary code with the privileges of the user running the application, Denial of Service, the creation of arbitrary files on the victim's system, "Trust Manager" bypass, or social engineering attacks.
There is no known workaround at this time.
All Adobe Reader users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=app-text/acroread-9.2"