HRESULT 0x80096011 (TRUST_E_MALFORMED

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TRUST_E_MALFORMED_SIGNATURE means the digital signature is malformed and cannot be processed as a valid signature.

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TRUST_E_BAD_DIGEST	TRUST_E_BASIC_CONSTRAINTS

TRUST_E_MALFORMED_SIGNATURE

TRUST_E_MALFORMED_SIGNATURE means that the signature data could not be parsed or does not have the expected structure for the trust operation. It differs from a digest mismatch: verification cannot reliably reach the normal integrity comparison.

Separate format failure from trust policy

Retain the original object and collect its hash before replacing it, because malformed signature data can indicate a damaged or incorrectly produced artifact.
Check whether the signing tool, packaging step, or transport modified the signature container after signing.
Use a current Windows trust API or a signing diagnostic tool to inspect the embedded or catalog signature.

Do not bypass this result by treating the object as unsigned unless the application policy explicitly permits unsigned content.

Microsoft: certificate and trust return values

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