Why did you change the pdf extension? That makes no sense.
Well, it makes sense in some context. I have an instance of Oracle E-Business suite version 12.1.3
This system can produce reports in PDF format that can be viewed on-screen or be printed. Most printers do not understand PDF so the report should be converted to postScript first.
There are several 3rd party utilities for doing this (oracle officially recommends them) and one of them is acroread. Actually its the only one of the three that supports landscape layout.
Unfortunately, all output files from Oracle applications has the "out" extension.
Looks like a problem of the Oracle software not using the correct extension.