There are many tools available online these days to convert PDF files to .step files. You can google for that or either you can use HIPDF software.
I am just using HI, it is a wonderful piece of software. The HI software is extremely intuitive to use. I just put in the address of the PDF, and it does the rest. You can just save as a .step file, and it will open it in HI. The tool I used came with a .step file that you could do an animation on. Now back on file. Open the .step file and copy and paste the following line of code.