It means tighten up your servers is what it means, stop anal-eyesing and start fixing.
If you didn't put it there and nobody that works for you did either, then odds are you've been breached..... so trying to figure out what it does is secondary.
Re-upload your last good copy of pages.
Check your own PC for trojans/keyloggers.
Change all passwords next.
Then, TIGHTEN your servers... ask your host for their best guy to help look at your servers configuration.
Good luck, peace.
Ben
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