Btrfs Assistant 1.0 is coming, testers needed

Well, I am still testing and learning!
I made a little script I called checkpdf to find corrupted PDF files. A Script to Find Corrupted (move/delete/..) PDF Files - #2 by limotux

Running it without specifying a specific folder seems to search ALL folders but returning results from some folders I know nothing about, and reporting some corrupted PDF file I am sure I did not put them, I did not even view them.

The PDF file here is mine but I do not know what that folder is:

/proc/10295/task/10295/cwd/zzz borken 2_1.pdf is OK

Now, my question is, are those “strange” folders, subfolders snapshots of my /home? system? snapshots of system? Installed by system or an app I installed?
Is it safe to delete these corrupted files in these strange folders?
I am still keeping my script to just display and not move or delete any files because I am not sure what are they.
P.S. Files named numbers are mine like “2_3.pdf”. Others I know nothing about them!
I care about removing corrupted files from previous snapshots of course. How to?
Here is a sample:

home/limo/zzz borken 2_3.pdf is OK
/home/limo/zzz borken 2_4.pdf is CORRUPTED
/home/limo/zzz borken 2_5.pdf is CORRUPTED
/proc/10295/cwd/zzz borken 2_1.pdf is OK
/proc/10295/cwd/zzz borken 2_2.pdf is OK
/proc/10295/cwd/zzz borken 2_3.pdf is OK
/proc/10295/cwd/zzz borken 2_4.pdf is CORRUPTED
/proc/10295/cwd/zzz borken 2_5.pdf is CORRUPTED
/proc/10295/task/10295/cwd/zzz borken 2_1.pdf is OK
/proc/10295/task/10295/cwd/zzz borken 2_2.pdf is OK
/proc/10295/task/10295/cwd/zzz borken 2_3.pdf is OK
/proc/10295/task/10295/cwd/zzz borken 2_4.pdf is CORRUPTED
/proc/10295/task/10295/cwd/zzz borken 2_5.pdf is CORRUPTED
/proc/1140/task/1140/cwd/zzz borken 2_2.pdf is OK
/proc/1140/task/1140/cwd/zzz borken 2_3.pdf is OK
/proc/1140/task/1140/cwd/zzz borken 2_4.pdf is CORRUPTED
/proc/785/task/72452/cwd/zzz borken 2_5.pdf is CORRUPTED
/proc/785/task/785/cwd/zzz borken 2_1.pdf is OK
/usr/share/cups/data/secret.pdf is OK
/usr/share/cups/data/standard.pdf is OK
/usr/share/cups/data/topsecret.pdf is OK
/usr/share/cups/data/unclassified.pdf is OK
/usr/share/cups/ipptool/document-a4.pdf is CORRUPTED
/usr/share/cups/ipptool/document-letter.pdf is CORRUPTED
/usr/share/cups/ipptool/testfile.pdf is CORRUPTED
/usr/share/doc/ghostscript/GS9_Color_Management.pdf is OK
/usr/share/doc/graphite2/api/refman.pdf is OK
/usr/share/doc/ijs/ijs_spec.pdf is OK