The signed.pdf will not open in Acrobat reader

[jbeuckm]

Error message: "An error exists on this page. Acrobat may not display the page correctly. Please contact the person who created the PDF document to correct the problem." and "At least one signature has problems."

To Reproduce

1. Generate self-signed p12 file (no password):

   openssl req -new -key myKey.pem -out cert.csr
   openssl x509 -req -in cert.csr -signkey myKey.pem -out cert.crt
   openssl pkcs12 -export -in cert.crt -inkey myKey.pem -out cert.p12

2. Add placeholder and sign PDF

   
   const pdfBuffer = fs.readFileSync('./test.pdf')

const pdfBufferWithPlaceholder = plainAddPlaceholder({ pdfBuffer, reason: 'Signing the pdf.', signatureLength: 3300, })

const signedPdf = signer.sign(pdfBufferWithPlaceholder, fs.readFileSync('./keyStore.p12')) fs.writeFileSync('signed.pdf', signedPdf)

3. Check signature with `pdfsig`

➜ $ pdfsig ./signed.pdf Internal Error (0): couldn't find default Firefox Folder Digital Signature Info of: ./signed.pdf Signature #1:

• Signer Certificate Common Name: com.testco.abc123
• Signer full Distinguished Name: E=joe@beigerecords.com,CN=com.testco.abc123,O=Test Co,L=St. Paul,ST=Minnesota,C=us
• Signing Time: Dec 01 2020 23:32:59
• Signing Hash Algorithm: SHA-256
• Signature Type: adbe.pkcs7.detached
• Signed Ranges: [0 - 1206821], [1213423 - 1214226]
• Total document signed
• Signature Validation: Signature is Valid.
• Certificate Validation: Certificate issuer is unknown.

  
  [signed.pdf](https://github.com/vbuch/node-signpdf/files/5627207/signed.pdf)

[vbuch]

Can't remember on top of my head if the trailer must always contain the full reftable. The initial version has a huge trailer, the signed one has a small one with lots of skipped numbers. But... I seem to have some memory that only overridden entries are mandatory in the updated version. I need to check if that's correct. Chrome's PDF reader seems to do alright with the file but it doesn't care of signatures. LiberOffice Draw shows some malformed version of the doc and shows there is a signature but can't show signature's details. So... yes, there is an issue with the file. If I happen to have some time, I'll check deeper.

[stale[bot]]

This issue has been automatically marked as stale because it has not had activity in the past 90 days. It will be closed if no further activity occurs. Thank you for your contributions.

[MallRoy]

I am also facing the same issue. do we have any workaround for this?