If the pdf files are properly formatted (no compression/all text selectable), you should be able to open a terminal and do (I know it works the other way around, not sure if libreoffice can actually do the reverse but it doesn't hurt to try)
libreoffice --headless --convert-to docx *.pdf
Just know that since docx is a proprietary format by microsoft, the results may be flawed. As a last resort I guess you could run a windows VM and try to convert your files with any big software known to be able to handle such files.
I knew someone who would eat a tomato for dinner with a few slices of carrots. Nothing baked, just a plain uncut tomato and slices of carrots.
I'm talking a functionnal human being, knowing the concept of cooking and the ability to walk to their kitchen with such a "dish" as they would call it. Not vegetarian either. They did like meat and whatnot. Saddest "meal" I've ever had the horror to laid my eyes upon.