http://sourceforge.net/projects/pdftodoc/

If you have more than one PDF documents to change, you can order Doc Converter ! You'll be able to transfer several PDF documents (200 max expected) and transform them shortly. An answer will be that this will depend together with the condition. Solutions while you will find circumstances that want you to use Word it's suitable to use PDF. In case you be given a document in PDF, converting it to Expression and the other way round is not difficult.

http://sourceforge.net/projects/pdftodoc/