Here are two ways to convert PDF documents into .DWG (drawing) files.
These are in fact free and they do a great job for the price. They both work the same in that the free versions will not process layer information if it is included in the PDF.
These converters are great alternatives to buying a full product that is dedicated to doing this and if you rarely need to convert a PDF to CAD these are especially great.
Both of these converters use your email address to send the file to you when it is finished converting.
One thing to note: Cometdocs has a cool feature that lets you register with them (for free) and this will allow you to store your converted documents on their server and have access to them wherever you have internet access. Otherwise, the files get erased after 24 hours.
Plus Cometdocs doe s a great job of retaining Text