You can test to use pdfgrabber (its freeware), it`s reset pdf to any microsoft office document.
You could also google about " pdf to word free" for different solution
It would output the .jpg or any imagefile without quality lost
EDIT: K googled a bit more about it, theres existing some tools like pdf-unlocker to remove passwords.
It seems there`s some problems to crack "new" pdf-files