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https://issues.apache.org/jira/browse/PDFBOX-6194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18077692#comment-18077692
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Tilman Hausherr commented on PDFBOX-6194:
-----------------------------------------
Yes, I just did it again with 3.0.8-SNAPSHOT:
processing file: 000025.pdf
01.05.2026 19:03:47 ERROR cos.COSObject:122 - Can't dereference COSObject\{76 0
R}
java.io.IOException: Length object content was not read.
at org.apache.pdfbox.pdfparser.COSParser.getLength(COSParser.java:872)
at org.apache.pdfbox.pdfparser.COSParser.parseCOSStream(COSParser.java:914)
at org.apache.pdfbox.pdfparser.COSParser.parseFileObject(COSParser.java:750)
at
org.apache.pdfbox.pdfparser.COSParser.parseObjectDynamically(COSParser.java:671)
at
org.apache.pdfbox.pdfparser.COSParser.dereferenceCOSObject(COSParser.java:625)
at org.apache.pdfbox.cos.COSObject.getObject(COSObject.java:117)
at
org.apache.pdfbox.pdmodel.PDPage.lambda$getContentsForRandomAccess$0(PDPage.java:276)
!image-2026-05-01-19-07-19-330.png!
> COSStream becomes COSDictionary after save — shared XObject reference
> replaced by Font
> --------------------------------------------------------------------------------------
>
> Key: PDFBOX-6194
> URL: https://issues.apache.org/jira/browse/PDFBOX-6194
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 3.0.7 PDFBox
> Environment: Windows Server 2016, Java 21, PDFBox 3.0.7
> Reporter: HABA
> Priority: Major
> Attachments: 000025.pdf, bad-000025.pdf,
> image-2026-04-20-12-33-11-057.png, image-2026-04-20-13-52-20-247.png,
> image-2026-04-20-13-52-44-302.png, image-2026-05-01-19-07-19-330.png,
> screenshot-1.png
>
>
> Hi,
> `document.save()` corrupts an `/XObject` on page 3 of a 3-page PDF.
> Before save:
> - `Obj5` = `COSStream` (ImageMask)
> After save:
> - `Obj5` = `COSDictionary` (Courier font)
> Pages 1–2 are unaffected. All pages share the same indirect XObject refs
> (`Obj4`, `Obj5`).
> Flow:
> - load PDF
> - render pages via `PDFRenderer.renderImageWithDPI()`
> - append invisible OCR text using `PDPageContentStream` (AppendMode.APPEND,
> Courier)
> - save document → corruption occurs
> Result:
> java.io.IOException: Unexpected object type: COSDictionary
>
> Reproduced consistently on:
> * Windows Server 2016, Java 21, PDFBox 3.0.7
> Not reproducible on:
> * Windows 11, Java 21 (same code + input)
> Likely related to shared indirect XObject being overwritten during save.
> Cannot share original PDF (confidential), but can test with synthetic
> reproducer if needed.
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