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PHP malware is one of the most commom malicious code found on the internet, mostly because it is the leading server-side language used on websites, followed by ASP, Java, ColdFusion and Perl (source). In order to address this issue, our tools are capable of detecting and cleaning up malware that weren't collected yet, but meet a complex set of characteristics that are considered malicious.
This malware uses free online obfuscator (FOPO - Free Online PHP Obfuscator) usually chosen by malware coders, however, there are cases where addon developers (Magento, usually) use this tool for they code as well, so be careful during cleanup.