A virus entered my PC (something with the extension _TOR) and now my PDF are corrupted?

Question

A virus entered my computer with the TOR extension. This virus replicate itself into every file folder including my USB drives connected to the computer. The computer has since been cleaned from the virus however now i cannot open a single PDF. I have tried installing the latest version of Adobe Reader from the Adobe site and tried there. I even took my files into other computers to see if I could open them; still nothing. I am able to see the size of the files and the files are all there some very large and others not so large so I know there is no "piece" of the file missing. The error I keep getting on every file is this "
Adobe Reader could not open ..... because it is either not
a supported file type or because the file has been damaged
(for example, it was sent as an e-mail attachment and wasn't
correctly decoded).
I am able to see the thumbnail picture of several of the files so i know the content of them is there. I don't know what else to do. Please help.

Answer 1

Let's try one thing; if that does not work, you may need to restore your documents from backup.
Open any of these PDFs with a text editor, then copy & paste the first few lines back here into the forum.  Or more directly
can you see a constant %PDF on the 1st position of the file?
if not, can you find %PDF in the first 1024 bytes of the file?