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We've had a few request for AcroForm support over the yeas but have yet to fully implement it. The document cataloge contains a /AcroForm entry that describes how the form and other content should be rendered. I still have to estimate the scope of work but not expect much pain for just static rendering.
Logical structures (14.7.1, PDF ISO 3200) is relatively new part of the specification one that I have not read about until coming across the PDF in question.
Originally the PDF in question was thought to have not rendered because of lack of support of for AcroForms. I've taken a pretty close look and the PDF is rather special in that it does not have the normal PageTree construct but rather a declarative hierarchy know as Logical Strucuture in the PDF specification.
No plans to support this format at this time as this is one and only sample we have seen to date.