you may be interested in installing the wiki to pdf extension ( http://www.mediawiki.org/wiki/Extension:Pdf_Export) which would be suitable for what you want to do and is currently being tested for use on wikimedia wikis. (http://test.wikipedia.org/wiki/Main_Page click download as PDF on the left hand side)
I believe test.wikipedia.org is using the Collection extension, not Pdf Export:
http://www.mediawiki.org/wiki/Extension:Collection
V/r,
Ryan Lane