How can we judge that the file is virus file or normal?
If SEP catches it that would be a good indicator
You can also upload to ThreatExpert (owned by Symantec) to analyse:
Or you can send to Symantec for review:
Here are a bunch of tools to also help assist you in making a determination:
Check its Reputation by either Running the Symantec Support Tool, check this Article:
Using Symantec Support Tool, how do we Collect the Suspicious Files and Submit the same to Symantec Security Response Team.
Submit the file to the Security Response Team on:
OR / AND
Hope that helps!!
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Agree with above comments.