On the picture below, you see two ways of using Adobe form. The first one on the left will be an adobe form inside a Wed Dynpro (WD) application, it is an online scenario. This WD will have a Web Service (WS) model for passing the data to an EJB that is exposed as a WS. This EJB will use a Business Object (BO) that will use the Java MDM API for entering the Master Data into SAP MDM.
The second way is a bit different. No use of Web Dynpro for runtime. You will have a pdf form file (Master Data entry form) displayed by acrobat reader that can be filled while you are offline. When you are online , you press on a submit button on the form and the form will invoke a WS on the SAP application server. This WS is implemented by an EJB and call a BO responsible for entering the data into MDM using the Java MDM API.