This is the warning I just got via Wordfence after the latest update of UpdraftPlus-Back Up Plugin
This file is a PHP executable file and contains the word 'eval' (without quotes) and the word 'unpack' (without quotes). The eval() function along with an encoding function like the one mentioned are commonly used by hackers to hide their code. If you know about this file you can choose to ignore it to exclude it from future scans.
I posted this in the Updraft forum and the plug in developer said it was a