Adobe Library 
The Adobe Library and its InteractiveForm UI element allows you to display a PDF document within a Web Dynpro application.
See:
Prerequisites
You need the following:
● A SAP NetWeaver AS System with Adobe Document Services (ADS)
Details
about installation and configuration can be found in the relevant guides on
the SAP Service Marketplace under the quick link /installNW2004s, and under 
Adobe Document
Services Configuration Guide.
Note that the layout designer is installed with the SAP GUI.
● A Web Dynpro ABAP application
● Adobe Reader (>= 7.0) and, if you are creating interactive forms, also the ActiveX Control Framework (ACF) installed on your computer. Also see SAP note 834573.
● ActiveX must be activated in the browser.