Extracting Metadata from Layers within PDF

I am not sure if this is the correct place to post about this, but here goes nothing... I am trying to extract data from Layers within a PDF drawing into some usable format, JSON, XML etc. I am working on CAD exports of drawings in PDF format. I am able to interrogate the various Layers within PDF XChange Editor, each of which relates to a Reference within the CAD model (Building Outline, Fence, Hedge etc.). I want to be able to extract all of the metadata from each of the Layers and display this in JSON/XML format (Fill Color, Opacity, Stroke Color, Stroke Opacity, Border Width etc.). Please can you let me know if this is possible with the Adobe PDF Extract API or any other API / services? Thanks.