Microsoft Office Excel 2000 SP3, 2002 SP3, 2003 SP3, and 2007 Gold and SP1; Excel Viewer 2003 Gold and SP3; Excel Viewer; Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats Gold and SP1; Office 2004 and 2008 for Mac; and Open XML File Format Converter for Mac allow remote attackers to execute arbitrary code via a crafted Excel spreadsheet that contains a malformed formula, which triggers "pointer corruption" during the loading of formulas from this spreadsheet, aka "File Format Parsing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5556
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2008/ms08-074
http://www.vupen.com/english/advisories/2008/3386
http://www.us-cert.gov/cas/techalerts/TA08-344A.html