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MikelKlink
MikelKlink
Participating Frequently
September 23, 2023

The message indicates that the actual signature container embedded in the pdf is not understood by Acrobat. This can have a number of causes. E.g. there might not be a signature container embedded at all, or it may have a format differing from what Acrobat expects, or it may be damaged. 

Without the actual file one cannot tell the exact cause. 

S
sujal324770064vhpAuthor
Participant
September 23, 2023
Then what should I do?
MikelKlink
MikelKlink
Participating Frequently
September 23, 2023

If you want to know the exact problem with the signature, you can share the file here for further analysis. 

Beware, though, this is a public forum, so you should only share if you are ok with the content of the pdf becoming public knowledge. 

If you don't care for the exact reason, simply ask the source of that pdf for a copy with a valid signature. Or - if the signature is valid but merely Acrobat does not understand it - for instructions how to validate the signature. 

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