how do I convert 3d pdf and .stl to .step

how do I convert 3d pdf and .stl to .step

2 Answers

It is possible with Tetra4.
https://tetra4d.com/tetra-4d-converter/

Very expensive for one time use.

This is a very simple model to recreate.
Use this guide/tutorial: Convert STL (or OBJ) Mesh to SOLIDWORKS Model (NURBS)
Remake the model in your favorite software. It should not take much more than an hour.