Suspicious files in my WP installation

Using an exploit scanner plugin, two files in my WP admin list are shown as being added recently, and I can’t find anything about them on the internet. When I open the files they are very odd, don’t look like normal WP php files to me. They are called:

wp-admin/network/

classmongodb.php
classmongodb-inc.php

the -inc file beings like this, with no comments or explanations and I can’t make heads or tails out of it.

[ Redacted, please do not post that here in these forums ]

And so on, and so on…

Is this part of the WP installation, or is it suspicious?