Is it possible to convert a PDF document into a Word document without having to download any other software?

I had a rather large & important document saved in Word. In order to upload it onto our company intranet, I convert it to a PDF, insert or change any bookmarks, save it as a PDF and have the web people do the upload.

Here’s the problem: I deleted the Word file accidentally! This is an issue because it’s much easier (for me) to add pages and do large scale edits in the Word document than in the PDF.

I’m not allowed to download software on my company PC, so I need to know if there’s a way to convert this very large document back into a Word file. I know it’s possible to do the edits in Acrobat, but for me, it’s a pain. If it’s not possible to do this, so be it, but I’m hoping that it can be done.