Thanks to PDFRasterfarian, I have been transferring loads of .pdfs to my reader. However, I didn't want to spend the money on Adobe Acrobat Pro to do it. Turns out, for us lucky mac users, that
www.smileonmymac.com has a program called "Pdfpen" which can crop pdf files. Retail price is $49.95, way cheaper than adobe. I tested it and it does work with PDFrasterfarian under parallels. Hope this helps people out looking for a solution!