Depends. First off submit it for review:
How to collect and submit to Symantec Security Response suspicious files found by the SymHelp utility
http://www.symantec.com/docs/TECH203027
You can submit the file to virustotal and threatexpert for review:
https://www.virustotal.com
http://www.threatexpert.com/
Second, run a threat analysis scan on the machine:
How to run the Threat Analysis Scan in Symantec Help (SymHelp)
http://www.symantec.com/docs/TECH215519
Try the Norton Power Eraser as well:
https://security.symantec.com/nbrt/npe.aspx
Also, run a full SEP scan with latest definitions. If you still suspect and issue, use a third party tool to run an additional scan.