Microsoft Word 2007 SP2 and SP3 does not properly handle memory during the parsing of Word documents, which allows remote attackers to execute arbitrary code via a crafted document, aka "Word PAPX Section Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A15426
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2012/ms12-064