Content Manager API to get all ISHTemplate objects with file extension of pdf

Task is to run a report using Content Manager API to get all ISHTemplate objects with file extension of pdf. I can't seem to find a field on the Ishtemplate object which stores that info. While looking in Organize Space in Docs 15.1.2 we can see the field EDT with level=data which displays the file extensions out of the box. TIA

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