This is a synthesized Certificate, where the signature algorithm is an INTEGER
rather than a SEQUENCE.


$ openssl asn1parse -i < [CERTIFICATE]
    0:d=0  hl=2 l=  12 cons: SEQUENCE          
    2:d=1  hl=2 l=   2 cons:  SEQUENCE          
    4:d=2  hl=2 l=   0 prim:   NULL              
    6:d=1  hl=2 l=   2 prim:  INTEGER           :0500
   10:d=1  hl=2 l=   2 prim:  BIT STRING        
-----BEGIN CERTIFICATE-----
MAwwAgUAAgIFAAMCAKs=
-----END CERTIFICATE-----

ERROR: Couldn't read Certificate.signatureAlgorithm as SEQUENCE

-----BEGIN ERRORS-----
RVJST1I6IENvdWxkbid0IHJlYWQgQ2VydGlmaWNhdGUuc2lnbmF0dXJlQWxnb3JpdGhtIGFzIFNFUVVFTkNFCg==
-----END ERRORS-----