what are these files in documents?

houstonbmac Said:

"what are these files in documents? The name on them begin with f_001a0a, f_001a0b. ...and they continue with last digits being variations."

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Trojan (Looping Item):

That would seem to me to be a looping item - a trojan of sorts that keeps repeating itself. So, you downloaded or installed software that is not intend for use on your Mac.

So...

First, clear your Temporary Internet Files - Apple Communities

Then, Scan your Mac for Malware: 

Use MalwareBytes for Mac --- This is software that searches for malware/adware. So, scan with it and then remove what is found. Once removed, uninstall MalwareBytes for Mac. Then restart the Mac.

Downloads:

1. Malwarebytes Anti-Malware for Mac
2. Malwarebytes Uninstaller

If Neither Works...

Reinstall the macOS:

1. First, Back up your Mac:

Create a Time Machine backup of your Mac, so that you can have something to restore your Mac from, should anything go wrong with the transfer.

2. Then, Reinstall the macOS:

Nothing would be deleted. It's just that items that have become corrupted or deleted, would be replaced or reinstalled back to where they should be. Go Here: How to reinstall macOS from macOS Recovery - Apple Support

Documents is the folder in your Home folder where you store your documents. Whatever those files are, they got there as the result of something you did. There is no way we would have any idea what they are.

FYI: These are user-only forums. This is not Apple Support. if you need to contact Apple Support, then contact product and tech support:  Contacting Apple for support and service including international calling numbers.

These forums only provide help with Apple products. Thank you for your understanding and support.