Best Free PDF Audio Reader Android Apps 

PDF Studio

It can read out the text of different languages present in PDF files.

@Voice Aloud Reader

Use this app to listen to PDF text content like an audio book.

Book Reader

It is an eBook audio reader app that can also read out text present in PDF files.

Evie

It can read out PDF file content along with PUB, MOBI, and AZW file text content.

PDF to Voice

Use it to listen to PDF content  at varying pitch and speed. 

Tap on the below icon to know more about these apps.