Not sure now what you want to do - i can copy from pdf to word and save text as a new pdf here.
But if you want to change the author's name or other properties then that should be possible - see Strawballs's link unless have you access to Foxit PDF creator or Adobe Acrobat? Both require a purchase.
If you wanna edit PDF without converting it to Word document, maybe you need the Adobe Acrobat, the most expensive and professional PDF editor. Or convert PDF to Word then edit in Word is much more cost effective I think. You can try this PDF to Word Converter, free one, but it can preserve the original text content, images, layouts after conversion. So that you can save it as PDF again without lossing anything. <a href="click here">Click here</a> to have a try. And here is a tutorial about how to <a href="click here">edit PDF text</a>. Hope it helps.