Questions

fistly i have zero level in programming and i need help.
I have local ebook android app.
If your rooted, u can extract pdf.
But problem is that pdf is protected by password(128 bits AES), not possible with password recovery.
Anyway this pdf is opened with that
Ebook android app without any password.
So i extrat android app, that showing publickey.pem, .rsa...ect.
I think password is autofill when reading book with local android app using publickey.pem, .rsa..ect..

Is that any way to know password?