The Download Manager in Adobe Acrobat Professional and Reader 8.1.2 and earlier allows remote attackers to execute arbitrary code via a crafted PDF document that calls an AcroJS function with a long string argument, triggering heap corruption.
http://www.vupen.com/english/advisories/2009/0098
http://www.vupen.com/english/advisories/2008/3001
http://www.us-cert.gov/cas/techalerts/TA08-309A.html
http://www.securitytracker.com/id?1021140
http://www.redhat.com/support/errata/RHSA-2008-0974.html
http://www.adobe.com/support/security/bulletins/apsb08-19.html
http://secunia.com/advisories/32872
http://secunia.com/advisories/32700
http://lists.opensuse.org/opensuse-security-announce/2008-11/msg00002.html
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=756