well they are definitely bugs ^^
Jokes aside, I have no idea how an image file would be a virus. They could be more descriptively named though.
You can export a GDocs document and generate the PDF from LibreOffice, that should have bookmarks. Or maybe there are tools to do this automatically: https://stackoverflow.com/questions/30304718/create-bookmarks-into-a-pdf-file-via-command-line
Damn, I was about to adapt a system and storyline myself from Hollow Knight as it is becoming one of the best games I played in my life, but decided to do a quick search for existing systems with low expectations. This looks awesome!