Microsoft Word 2007 SP3, Word Viewer, and Office Compatibility Pack SP3 allow remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted Office document, aka "Microsoft Office Bad Index Remote Code Execution Vulnerability."
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2014/ms14-069
http://www.securitytracker.com/id/1031189