How to Open PDF Documents on Android mobile?
Adobe Reader is one of the necessary application for Android powered mobile or Tablet for accessing PDF files downloaded from internet or any source.Since Adobe Reader is a freeware you can easily download it from Google Play Store.For your convenient I have given a link to Adobe reader at Play Store 
Features of Adobe Reader for Android:
PDF files can be directly viewed from Email or anywhere in the web without downloading it but Share option should be present there.
Excellent Zoom In and Zoom Out response for viewing text and images clearly in smartphones.
Cloud sharing is possible on both PC and mobile devices.
Thumbnails and Bookmark features helps you to access the documents very quickly.
Adding Comments,feedback,freehand drawing tool and Add text tools are added for User Friendly.
Editing,deleting and renaming PDF documents are more easier than before with enhanced performance.
Signature feature has been improved with Electronically signed documents.It helps you to send the signed PDF documents using your finger.
Adobe Reader is available in 18 languages :O
Download : >Adobe Reader for Android from Google Play Store
I hope everything ran well for you.If you face any issue then drop a comments I will try my best to solve the same 
