Our local building department has started using ProjectDox for submitting e-plans for review.  The instructions they provided to customers say that drawings need to be vector pdf, but go on to recommend how to do this using Autodesk Vector Graphic Converter "DWG to PDF.pc3 plotter driver". 

https://www.muni.org/Departments/OCPD/development/BSD/ePlan/MOA_ProjectDoxApplicantManual083016.pdf

I am using a Autocad LT for Mac 2015 and use the built-in Mac method for making batch pdfs from the plot window in Autocad.  Is this making a vector pdf?