Microsoft Office Word 2000 SP3 and 2002 SP3 and Office 2004 for Mac allow remote attackers to execute arbitrary code via a Word document with a crafted lcbPlcfBkfSdt field in the File Information Block (FIB), which bypasses an initialization step and triggers an "arbitrary free," aka "Word Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5934
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-072
http://www.vupen.com/english/advisories/2008/3384
http://www.us-cert.gov/cas/techalerts/TA08-344A.html
http://www.securitytracker.com/id?1021370
http://www.securityfocus.com/archive/1/499086/100/0/threaded
http://www.coresecurity.com/files/attachments/CORE-2008-0228-Word.pdf