PDF Reader Pro iOS supports sharing the in-app documents via AirDrop, which lets you share instantly with people nearby.
1. Run PDF Reader Pro iOS -> Go to Documents ;
2. Do one of the following to start sharing:
1) Click in the upper right corner of your screen, select a file you'd like to share and click Share ;
2) Click of the target file, and then click Share ;
3. Choose to share the file via AirDrop and select the person whom you would like to share with.