A conversion of a 3D model / CAD file is to PDF format is possible and is usually done so the output is called 3D PDF file.
This creates a rotatable 3D preview of the model on one of the pages of PDF document. A lot of 3D modeling tools nowadays have this function, but you may also use some dedicated 3D converter for it. In Any case, some kind of 3dm to pdf conversion should be doable just fine.