m2cmds.php: Magento 2 Dev Tool or Deceptive Hacktool?

Is this m2cmds.php file an insecure third-party dev tool for Magento - or a malicious hacktool used by an attacker?
Skimmer Loaded Via Image On MemberPress Checkout Form & Magento

A payment card skimmer hidden within an existing PNG image on an infected WordPress website that uses MemberPress and collects payment data for private membership. A variant was also found stealing payment card information on an infected Magento website.
Magento 2 Skimmer Uses getCredentialStorage

A PHP skimmer injected into a Magento 2 core file and used to steal login data from HTTP requests.
Magento 2 PHP Skimmer 0x3C Captures Customer Data To Image File

A PHP skimmer injected into a Magento 2 core file that captures POST data on the cart checkout page and saves the stolen data to an image file on the hosting server.
Magento PHP Injection Loads JS Skimmer

A JavaScript skimmer that conditionally loads from malicious PHP code injected into a Magento file.