Hi David, Tetra4D Converter is a plugin to Acrobat XI, DC, and 2017 Professional that will allow you to convert CAD to 3D PDF, and back to STEP or other neutral formats. One important note: many other 3D PDF conversion tools only translate the tessellation or faceted data, where our tools also allow for B-Rep, exact geometry. I mention this because if the 3D PDF file you have was not converted using our tools or some other software allowing for B-Rep, this will not work. If you have the native CAD file, you can convert using the PRC B-Rep option with our tools, then export to STEP. Feel free to email me directly at jordan@techsoft3d.com with any questions. Best regards, Jordan Tech Soft 3D
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