Acrobat Reader only supports signedData/version 1. Would be preferred to support signedData/version 4 (v2)
so ETSI EN 319 122-1 V1.1.1 (2016-04) support required. (signer-attributes-v2). Support signedData / certificates and Attribute certificate v2.
The signature dictionary shall contain a value of ETSI.CAdES.detached for the key SubFilter. (TS
102 778-3 V1.2.1, 4.2.e)
The ESS signing-certificate attribute or the ESS signing-certificate-v2 attribute as defined in
clause 5.7.3 of CAdES (TS 101 733 [2]) shall be used as a signed attribute. (TS 102 778-3 V1.2.1,
4.4.3)
And display attribute certificate detailed data not only in HEX format in certificate view. If it is an octet string show in string and all detailed data which can be converted to string in an ASN1 seq, to show all the attributes.