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PDF Digital Signature Verification

Aspose.Pdf fails the digital signature verification for the signed PDF.  The document was created using Aspose. The signature is verified successfully by Adobe Reader, so I am pretty confident the document is created and signed correctly. However, both methods verifySignature and verifySigned return false during the signature check. 

Note the certificate used to sign the document is self-signed.  I obviously do not have the private key used  by the document signer, only the public one (certificate).  The test program, PDF document, and certificate are in the ZIP file attached to this post.  Can you please advise?

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