you can change pdf to text easily in linux environment (no idea in windows) and then to word document easily. that's the way i do but don't know the software. nw suggestion might work. but, copying some part of pdf file is better to using "Select" tool (might help avoiding plagiarism to some extent) if you open file by Acrobat Reader, which can not be done if opened using Xpdf, PDF File Viewer, KGhostView, etc.