This one worked good for raster scanned file.
https://www.zamzar.com/convert/pdf-to-dwg/
Vector PDF can be imported directly into AutoCAD with PDFimport.
PFD converters
I like "Any PDF to DWG Converter" it seems simple and is the exact same output as "Aide PDF to DWG Converter" Also the EUA is good. one computer with many users is ok.
