Revit -> PDF -> Autocad

[ILoveMadoka]

I have a series of PDF sheets created from Revit. When I import a PDF sheet into Autocad,

some sheets convert everything to autocad geometry while some other sheets only convert

a few lines/text objects. The rest are raster images.

What setting(s) controls whether a PDF is seen as vector vs raster by Autocad?
Ideally, I'd like to get all the sheets in a PDF format that will import and convert everything in Autocad as usable entities.
 

(I do not think they will convert it to a .dwg format for me).