The document has two digital signatures, why see only one

Report · Sep 13, 2017

The document has two digital signatures, and why use Adobe Reader to see only one digital signature and one signature picture.Second signatures cannot be recognized!

Report · Sep 13, 2017

Thank you, everyone, just the message hasn't been edited and sent out, sorry

Report · Sep 13, 2017

The document has two digital signatures, and why use Adobe Reader to see only one digital signature and one signature picture.Second signatures cannot be recognized.

The demo document 64188119658.pdf

Any assistance you can render me will be appreciated.

Report · Sep 13, 2017

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Report · Sep 13, 2017

Can someone tell me what's wrong with the document?

Report · Oct 09, 2017

Without going into a detailed analysis, I would conjecture that the second signature incremental file section is not properly formed. The PDF spec says that the last line of a file must be %%EOF, and Each line shall be terminated by an end-of-line (EOL) marker, which may be a CARRIAGE RETURN (0Dh), a LINE FEED (0Ah), or both. In this file, the %%EOF at the end of the first section is followed immediately by an object in the incremental save section (1 0 obj) which deleted the EOL at the end of the first section. I notice that if I "Enable Editing" of the file, the second signature appearance disappears.

You might also have words with the ShenZhen Certificate Authority, since they are still using SHA1, when that has been deprecated for several years in favor of SHA256. And, I expect, their certificates are also still malformed (using BER encoding rather than DER encoding).

Adobe Community

The document has two digital signatures, why see only one