Backdoor check on virustotal

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If virustotal not able to detect virus or backdoor on nulled wordpress elements then how we find and clear that ?

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Follow this https://www.nulledforums.to/showthread.php?tid=140

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Does anyone know how to respond? I have the same doubt.

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actually virustotal fails to find those, also recently gave me false alert on original theme that I bought on themeforest. I searched all the files looked up all the code one by one, and simply there was nothing!
you can try the theme on local or the website that you don't care much, or tracking with a plugin called wordfence

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Is always better to test and develop you website with nulled templates (just to try) an then buy the original theme and use only the original in production websites!

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@Shadow 
that's said to check for some word like :
base64 a very nasty way of obfuscating scripts which sends back information to attackers server.

so.. what to do with base64 ? Delete the line ? replace it ?
That not give us detail of what to do if we find something.

Thank you