When you open a STEP CAD drawing in one of the CAD software, yu can probably simply export it as PDF for sharing purposes. Such file won't be longer useable as CAD file though, but step to pdf conversion should definitely be doable in many 3D modeling tools or even dedicated converters.
Open STEP file Open PDF fileA 3D product data optimalization software
An online CAD conversion service
A CAD visualizaton, analyzation and translating system
A commercial online CAD converter