Hope you are doing well and sorry for the trouble. As described, Adobe Acrobat Reader DC can´t open 3D-pdf anymore and throwing the error "A 3D data parsing error has occured"
Please try to update the application to the recent version 21.07.20099 from the help menu > Check for updates and reboot the computer once and see if that works for you.
You may also try the steps below and see if that helps:
1. Close Adobe Acrobat /Reader DCversion and rename the following folders:
2. Reboot the computer once.
Hope this information will help
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Thank you for you quick reply. This solved the problem, so thank you for your support!