Shout me down if I'm wrong here but I was under the impression you could make any word or image document a pdf just by exporting it? You certainly can on my Mac, click on file/print and there's a box that asks if you wanna save as a pdf or something...I dunno. Definitely works on my Mac though.
EDIT: Just had a look on a Linux as well, there's an 'export as pdf' option in the file menu for word processing.