Not able to sign some complex documents, with a unacceptable xref root

@vbuch Describe the bug and the expected behavior --> Currently, I am using this library to signup a document and then verify it, over in the code I initially create a placeholder via plainPlaceholder and then sign it using the signer, which works for some pdf but throws an error as " SignPdfError: Failed to find the pages descriptor. This is probably a problem in node-signpdf." in some of the complex PDF's

Is it a bug in signing or in the helpers? If it's an issue with helpers, within the /helpers/plainAddPlaceholder/getPagesDictionaryRef.js:20:11

To Reproduce To reproduce try signing the file "pdf_scripting.pdf", by adding a planeAddPlaceHolder to it initially and then signing it via the signer, as in the code below --->>>

// Generate p12
const pkcsAsn1 = forge.pkcs12.toPkcs12Asn1(
    privateKey,
    [certificate],
    passphrase,
);

// Convert to Buffer
const pkcsAsn1Bytes = forge.asn1.toDer(pkcsAsn1).getBytes();
const pkcsb64 = forge.util.encode64(pkcsAsn1Bytes);
const pk12Buffer = Buffer.from(pkcsb64, 'base64');

pdfBuffer = plainAddPlaceholder({
    pdfBuffer,
    reason: 'No reason provided',
    location: 'Random Location',
    signatureLength: pk12Buffer.length,
});

return signer.sign(pdfBuffer, pk12Buffer);

The Findings I found that this error might have been at the regex check in the helper file getPagesDictionary, The above file giving error had a info.xref.root as "'\n/S /JavaScript\n/JS (event.value = "www.pdfscripting.com"\r\n\r\n)\n'", while the one which worked properly had a info.xref.root as "'\n/Pages 2 0 R\n/Type /Catalog\n'".

Can you modify the regex to accept the below-attached files, or please provide us with a different solution.

Error Throwing pdf -> pdf_scripting.pdf Working pdf -> sample.pdf

vbuch / node-signpdf

Not able to sign some complex documents, with a unacceptable xref root #168