Microsoft today released a free tool for enterprises and developers that detects whether an Office file contains malicious content.
You can get it here:

•Microsoft Office Visualization Tool (OffVis). A free tool designed to help combat file format-based software vulnerabilities and exploits, OffVis will allow customers to better understand and deconstruct Microsoft Office-based attacks. As a result, security vendors can build deeper, more precise malware detection signatures and develop new techniques for analyzing malware. The tool is available for no-charge download.



Sorry folks, I have downloaded it but haven't had a chance to play yet