Unspecified vulnerability in Microsoft Word in Office 2000 and XP SP3, 2003 SP2 and SP3, and 2007 Office System SP1 and earlier allows remote attackers to execute arbitrary code via a Rich Text Format (.rtf) file with a malformed string that triggers a "memory calculation error" and a heap-based buffer overflow, aka "Object Parsing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5494
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-026
http://www.zerodayinitiative.com/advisories/ZDI-08-023
http://www.vupen.com/english/advisories/2008/1504/references
http://www.us-cert.gov/cas/techalerts/TA08-134A.html
http://www.securitytracker.com/id?1020013
http://www.securityfocus.com/bid/29104
http://www.securityfocus.com/archive/1/492020/100/0/threaded
http://www.kb.cert.org/vuls/id/543907