PDF At least one signature is invalid - Document has been altered or corrupted since it was signed

Question

I'm creating a signed PDF by code and I receive this error for some reason:

At least one signature is invalid - Document has been altered or corrupted since it was signed

I used DSS attribute with VRI, Certs and CRLs. The important mention is that I use versions as I saw on other articles that talk about this procedure. So I have the signature in the first part (with Contents<> and ByteRange[]) and the DSS with his children in the second part. I noticed that if I remove the second generated part, Adobe Acrobat gives me the:

Signed and all signatures are valid

Therefore I'm assuming that the Contents/ByteRange works well and the problem arise when Acrobat tries to verify the signature with the informations from the second part.

Here are both samples:

Only the first part (second removed manually after creation)

%PDF-1.6
%âãÏÓ
5 0 obj
<<
/ProcSet [/PDF /ImageC /Text]
/Font
<<
/F10 6 0 R
>>
>>
endobj
4 0 obj
<<
/Type/Page
/Parent 2 0 R
/MediaBox [0 0 612.000 792.000]
/TrimBox [0 0 612.000 792.000]
/CropBox [0 0 612.000 792.000]
/BleedBox [0 0 612.000 792.000]
/Contents 7 0 R
/Resources 5 0 R
>>
endobj
7 0 obj
<<
/Length 689
>>
stream
1.000 g
q
0.750 0.000 0.000 -0.750 0.000 792.000 cm
0.000 g
/F10 13.333 Tf
0 Tr
0.000 Tc
BT
1 0 0 -1 67.200 77.506 Tm
[(\001)(\002)(\003)(\004)(\005)(\006)(\004)15(\007)(\006)]TJ
ET
Q
q
0.750 0.000 0.000 -0.750 0.000 792.000 cm
0.000 g
/F10 13.333 Tf
0 Tr
0.000 Tc
BT
1 0 0 -1 67.200 63.106 Tm
[(\005)]TJ
ET
Q
q
0.750 0.000 0.000 -0.750 0.000 792.000 cm
0.000 g
/F10 13.333 Tf
0 Tr
0.000 Tc
BT
1 0 0 -1 67.200 999.106 Tm
[(\005)]TJ
ET
Q
q
0.750 0.000 0.000 -0.750 0.000 792.000 cm
0.000 g
/F10 13.333 Tf
0 Tr
0.000 Tc
BT
1 0 0 -1 0.000 10.306 Tm
[(\005)]TJ
ET
Q
q
0.750 0.000 0.000 -0.750 0.000 792.000 cm
0.000 g
/F10 13.333 Tf
0 Tr
0.000 Tc
BT
1 0 0 -1 748.800 10.306 Tm
[(\005)]TJ
ET
Q

endstream
endobj
2 0 obj
<<
/Type/Pages
/Count 1
/Kids [4 0 R ]
>>
endobj
1 0 obj
<<
/Type /Catalog
/Pages 2 0 R
/AcroForm
<<
/DR
<<
/Font
<<
>>
>>
/Fields [ 8 0 R  ]
/SigFlags 3
>>
/Version /1.6
>>
endobj
10 0 obj
<<
/Producer (þÿ\000\130\000\106\000\040\000\104\000\145\000\142\000\165\000\147\000\040\000\130\000\056\000\130\000\056\000\130\000\040\000\142\000\165\000\151\000\154\000\144\000\040\000\130\000\130\000\130\000\040\000\055\000\040\000\124\000\162\000\151\000\141\000\154\000\040\000\115\000\157\000\144\000\145)
/Creator (þÿ\000\130\000\106\000\040\000\104\000\145\000\142\000\165\000\147\000\040\000\130\000\056\000\130\000\056\000\130\000\040\000\142\000\165\000\151\000\154\000\144\000\040\000\130\000\130\000\130\000\040\000\055\000\040\000\124\000\162\000\151\000\141\000\154\000\040\000\115\000\157\000\144\000\145)
/Trapped /False
>>
endobj
11 0 obj
<<
/Type /Encoding
/Differences [
5 /space
4 /e
3 /m
2 /o
1 /s
6 /t
7 /x
]
>>
endobj
6 0 obj
<<
/Type /Font
/Subtype /Type1
/BaseFont /Times-Roman
/Encoding 11 0 R
/FirstChar 1
/LastChar 7
/Widths [389 500 778 444 250 278 500 ]
>>
endobj
8 0 obj
<<
/Type /Annot
/Subtype /Widget
/Rect [0.000 0.000 0.000 0.000]
/P 4 0 R
/T (TEST)
/FT /Sig
/V 3 0 R
>>
endobj
3 0 obj
<<
/Type /Sig
/Filter /Adobe.PPKMS
/SubFilter /adbe.pkcs7.detached
/Name (Test KeyStore)
/Location (RO Bucharest)
/Reason (debug sig)
/M (D:202002240829Z)
/Contents 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Also I hardcoded the IDs in both versions because from what I understand, the ID must be unique, but the way that you calculate it is unimportant so if I just want it to work without errors it doesn't seem very important right now.

Answer 1

Solution

the initial cross references must be continuous and may not have gaps. Adobe Reader signature validation sometimes is picky in such details, in particular when validating later revisions

by mkl