If the PDF image was created from vector-based software, then you can load it into Adobe Illustrator and export directly into either a DXF or an AutoCAD DWG. It seemed to work OK for me - the fonts looked pretty weird in Illustrator, but it converted to DWG in good shape - appears to be to scale, too (in mm) .
I'd attach it, but you need to get permission from Amb. I'm not prepared to go that far without his concurrence.
