PDF Malware? (OpenAction)

Hey!

A pdf file I put on virustotal; virustotal says that /OpenAction 1 (meaning it has OpenAction, I assume). This PDF file came from an infected PC. I put on another random PDF file I downloaded from net, pretty reliable source - no OpenAction there.

How can I now see what this OpenAction is in this file? In fact what is OpenAction? How can I check if it’s malware? Virustotal gave no alerts about malware though!

What would be helpful is the URL for the VT results page.

What did you find from a google search on it ?
http://www.google.com/search?q=pdf+file+OpenActio
http://securitylabs.websense.com/content/Blogs/3202.aspx