Could you please let me know the version of Android installed on the tablet?
What is the version of Acrobat Reader app installed on the tablet?
Please visit this link for the same: Acrobat Reader Help for Android: Troubleshooting FAQs
What are steps you are taking to print the pdf files?
Would it be possible for you to share the pdf file with us, i have sent you a private message for the same, please respond to that message.