Submit the file to Symantec to make sure it is a false +. Then you can exclude the file till Symantec gives you a definition that takes care of this.
How to Use the Web Submission Process to Submit Suspicious Files
http://www.symantec.com/business/support/index?page=content&id=TECH102419
If this is a real threat, symantec will give you a definition to fix this.
If you are sure it is not an infection, submit the file & create exclusion for the time being.
Creating Centralized Exceptions Policies in the Symantec Endpoint Protection Manager 11
http://www.symantec.com/business/support/index?page=content&id=TECH104326