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.
It contains both the ESS signingCertificateand the ESS signingCertificateV2attributes. While RFC 5035 in 2007 allowed this to ensure compatibility with legacy applications, it already mentions possible issues resulting from that. PAdES BASELINE consequentially requires exactly one of those attributes.
It contains the signingTimeattribute. PAdES BASELINE forbids the use of this attribute. The claimed signing time shall be put into the signature dictionary M entry.
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.