I know this is an old post, but maybe I can help others looking. Since I came to Adobe looking for this answer for Android and was sent to the forums and found this. I too use 3D pdfs in the CAD world and they are very helpful used in Adobe for Windows. I haven't found that adobe for Android will open 3D pdfs (if I'm wrong please let me know). Alternatively in Play Store look for 3D pdf Reader by Tech Soft 3D, it works great!
There is a new app currently in beta developed by Tech Soft 3D called Tetra4D Reader. This mobile reader is for Android and capable of viewing the entire 3D PDF document, beyond just your 3D model, including tables, view previews, buttons, etc. This app will only consume interactive 3D PDF documents that are created with the Tetra4D Enrich software. You can get a free trial for Enrich and install the new mobile reader from the links below.