Adobe Reader (formerly Adobe Acrobat Reader) is a closed-source PDF reader.
A remote attacker could entice a user to open a specially crafted PDF document, possibly resulting in the remote execution of arbitrary code with the privileges of the user.
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-8.1.2-r3"