One of the handiest features of Word 2013 is that it can now open and edit PDF files. Word has long been able to save into PDF format, but the ability to edit PDF files is a welcome addition to its arsenal.
As the Word 2013 blog points out, you won't necessarily get an exact replica of the original PDF (so fussy font jockeys obsessed with precise kerning will need to look elsewhere). However, the reflow feature will recognise most headings and other formatting features. Definitely helpful if you get sent a PDF you need to repurpose and don't want to mess with Acrobat (or pay for it).