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When I create a PAdES signature with Acrobat and open the Advanced Signature Properties, I see 4 properties: Creator, Hash Algorithm, Signatue Algorithm, and PAdES Signature Level.
I would like to know how the PAdES Signature Level is populated (i.e. what part of the Signature Dictionary is being read).
I have a PAdES signature that was created outside of Acrobat. It shows as LTV enabled in the signature pane, but in the advanced properties it's missing the entry for PAdES Signature Level.
What info is Acrobat looking for to populate this information?
Sample signed document is here.
First of all, the PAdES signature level you mention refers to the PAdES BASELINE profiles according to ETSI EN 319 142-1. To understand what Adobe Acrobat should look for to determine that PAdES signature level, please study that norm. You can download it e.g. at https://www.etsi.org/deliver/etsi_en/319100_319199/31914201/01.01.01_60/en_31914201v010101p.pdf
Concerning your sample signed document: There are errors in the embedded signature container of your PDF signature as far as PAdES BASELINE
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First of all, the PAdES signature level you mention refers to the PAdES BASELINE profiles according to ETSI EN 319 142-1. To understand what Adobe Acrobat should look for to determine that PAdES signature level, please study that norm. You can download it e.g. at https://www.etsi.org/deliver/etsi_en/319100_319199/31914201/01.01.01_60/en_31914201v010101p.pdf
Concerning your sample signed document: There are errors in the embedded signature container of your PDF signature as far as PAdES BASELINE specifications are concerned.
So the signature in your document does not follow the requirements for PAdES BASELINE signatures. Consequentially, Adobe Acrobat should not claim any PAdES signature level.