Recently, a requirement came up for importing data from a fillable PDF form into Dynamics AX 2012. With the right tools, this is actually quite straightforward.
PDF Labs have a product called PDFTK Server, which is a free download. However, if you need commercial support from them that’s a paid service. Likewise, if you want to redistribute the software and your software is not licensed under the GPL (Hint, Dynamics AX is most certainly not GPL-licensed…), you’ll need a redistribution license. The link to the license is here, and the product download is here.