OK, quick fix, in AdESObj.pas, and in procedure TAdES.RSAExtractPrivateKey:
// Sequence is:
// modulus, public exponent, private exponent, prime1, prime2
// exponent1, exponent2, coefficient
RSA.inputFormat := raw; // <=================== ADD THIS
RSA.outputFormat := hexa;
RSA.modulus := ASN.RSAKeySet.modulus;
Note that if the certificate is not in the Windows Store, Acrobat will not validate the signature.