[PDFBOX-4995] Multiple PDF signatures with image

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 2.0.20
• Assignee: Unassigned
• Reporter: Daniel Gorelic
• Created: 19/Oct/20 19:27
• Updated: 20/Oct/20 16:38
• Resolved: 20/Oct/20 15:10

Description

A second PDF signature with an image invalidates the first one. If there is no image, the first signature remains valid.

This is what DSS team member wrote:

Indeed this appears to be a PDFBox bug: One indirect object from the original document revision is completely unnecessarily overwritten in each signed revision with an object with the identical content. In spite of this not actually changing the page content, Adobe Reader apparently considers this suspicious enough to claim a document change and signature invalidation.

The object in question is the object 54 0 which is a color space resource for each of the three document pages:

54 0 obj
/DeviceGray 
endobj 

Issue Links

• duplicates: PDFBOX-4997 Incremental update adds certain objects not marked as needing update