File appears to be malicious or unsafe

Hello,

I’m getting the following mesage from Wordfence that is running on a website protected with “Security by Cleantalk”:

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File appears to be malicious or unsafe: wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Scanner/HeuristicAnalyser/tests/Cases/Math/bad.php

• Filename: /home/digitala/lawhouse.ae/wp-content/plugins/security-malware-firewall/lib/CleantalkSP/Common/Scanner/HeuristicAnalyser/tests/Cases/Math/bad.php
• File Type:?Not a core, theme, or plugin file from www.remarpro.com.
• Details:?This file appears to be installed or modified by a hacker to perform malicious activity. If you know about this file you can choose to ignore it to exclude it from future scans. The matched text in this file is:?$cJmklSv7 = $pu8lxD9[(21 – 13)
• The issue type is:?Obfuscated:PHP/MaliciousMath.13239
  Description:?Obfuscated malicious code that includes some math expressions combined with string concatenation

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Please advise. Should we ignore or delete or else??!!!

Thanks