Power Automate Desktop - PDF Library

[erincannon1]

Does anyone know what PDF libraries Power Automate Desktop is using to process PDFs?  I have a desktop flow that flattens and combines documents with digital signatures.  I would like to get this process off my computer and into an azure function, but so far cannot find a library that can do anything with the certified pdf files.  

Any ideas?

[erincannon1 · Accepted solution]

An update:

I was able to create an Azure function to combine PDFs that were digitally signed and "encrypted" by using Python PikePDF to remove the security and PYPDF2 to merge the pdfs.