I have a program called pdf2cad... that takes a *.pdf and converts it to a *.dwg file... works very well and at worst you can have a graphics file that you can trace, and if the *,pdf was created by a cad program, the actual layers are extracted. I should note that the graphics file is to scale. Also if you have some redacted pdf files, the solid part is on a separate layer sometimes.
Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?
-Dik