Recently I found that Acrobat reader seems to stop doing revocation checking for signer's certificates over OCSP after the certificate expires. Can you please let me know if this is right?
Hope you are doing well. Per the description, I understand you want more about revocation checking for the signer's certificate over OCSP.
The process is still active, and you can refer to the article to know more: Validating digital signatures, Adobe Acrobat
Hope this helps.