Adobe Reader is a closed-source PDF reader.
Multiple vulnerabilities have been found in Adobe Reader, including an integer overflow in TrueType Font handling (CVE-2012-0774) and multiple unspecified errors which could cause memory corruption.
A remote attacker could entice a user to open a specially crafted PDF file, possibly resulting in execution of arbitrary code with the privileges of the process or a Denial of Service condition.
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-9.5.1"