There is a lot of program providing conversion  PDF to AutoCAD DXF or DWG files.

Generated file has one or just a few layers. Able2Extract software can produce AutoCAD drawing with

Polyline width from Source of Document (setting shown below)

Our company developed application PDF-DWG-Layers running inside AutoCAD. With using of this program you can improve DWG or DXF file converted with  Able2Extract software to drawing with layers. Polylines of specific width are placed on separate layer with automatically assigned color. All advantages of drawing with layers can be used: turn on/off, freeze/thaw or delete layers, hide or isolate objects. PDF-DWG-Layers allows you quickly clean-up file and work faster on further development of AutoCAD drawing.