only if it's not protected is the answer.
Apparently Open Office 3 has native support: http://www.labnol.org/software/download/openoffice-free-pdf-editor-without-acrobat/2187/
There are plenty of PDF editors out there! Just one search on google gets me over 52 million results!
Here are just a few:
http://www.foxitsoftware.com/pdf/editor/
http://www.nitropdf.com/free/hammer/index.htm
http://www.verypdf.com/pdf-editor/index.html
http://www.pdfill.com/