You might be able to do a select all and copy the data into the word doc, however you will probably loose the formating. The pdf's are secure documents, and so they make it hard for them to be changed.
Other than GetboxMan's suggestion, you'll want to be sure that the IRS will accept a Word document bfore doing the work. My agency collects tax documents and we're very specific about what you send back. It needs to be something that works with our data collection software.
At any rate, if they DO accept Word documents, you may want to try out the trial version of Acrobat. It has the abiity to save as a Word document (although the success rate can be low). The trial is fully functional and free for 30 days.