How do you insert a pdf into cad? I want to combine 2 pdf.s can i do this in AutoCad?

It is not possible to insert PDF in AutoCAD. You may try commercial PDF to DXF conversion tools.

it's a lot easier to open it in adobe write or reader and copy the pdf to the clipboard and paste into paint and saveas tiff or jpeg. you will have to scale it in drawing but you won't run the risk of it looking like garbage after having run it through a dxf converter, and best of all it's free and legal.