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I am also looking at some options to convert PDF files to DWG or DXf format.
AnyDWG software (http://anydwg.com) has a converter and the trial version allows a limited number of conversions, it converts PDF to DXF fomrat.
AideCAD converter (http://www.aidecad.com) converts PDF to DXF format in batch.
Adobe Acrobat (http://www.adobe.com/products/acrobat.html) has the copy graphics tool to copy the graphics to the clipboard.
Adobe Illustrator (http://www.adobe.com/products/illustrator.html) that can save a PDF in DWG or DXF format.
The free Ghostscript & GSView (http://www.ghostscript.com) can export PDF to DXF.