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https://issues.apache.org/jira/browse/PDFBOX-5297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17435742#comment-17435742
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Tilman Hausherr commented on PDFBOX-5297:
-----------------------------------------
It is specific to this file, I've never seen this in the wild before. But
obviously there is some software out there that produces these bad files. The
code presented here won't hurt correct files.
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString
> -------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5297
> URL: https://issues.apache.org/jira/browse/PDFBOX-5297
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.24
> Reporter: Chris Newhouse
> Priority: Major
>
> A customer provided us with a PDF that contains an AcroForm and has some of
> the data filled in. There are various ways to trigger the error, but here's a
> stacktrace:
> {code:java}
> class org.apache.pdfbox.cos.COSName cannot be cast to class
> org.apache.pdfbox.cos.COSString (org.apache.pdfbox.cos.COSName and
> org.apache.pdfbox.cos.COSString are in unnamed module of loader 'app')
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.getDefaultAppearanceString(PDVariableText.java:91)
> at
> org.apache.pdfbox.pdmodel.interactive.form.AppearanceGeneratorHelper.<init>(AppearanceGeneratorHelper.java:114)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDTextField.constructAppearances(PDTextField.java:263)
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:331)
> at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
> Method)
> at
> java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.base/java.lang.reflect.Method.invoke(Method.java:566){code}
> The PDF contains sensitive user information, so I cannot post it here
> publicly, but I'd be willing to submit it to a private upload area. When I
> use an editor to remove/change the sensitive data, the problem goes away or
> sprouts up as a different error (related to fonts).
>
> Here is a little bit of metadata I can provide right now:
> {code:java}
> {
> "Author": "SE:W:CAR:MP",
> "CreationDate": "D:20211012165530Z00'00'",
> "Creator": "Adobe LiveCycle Designer ES 9.0",
> "Keywords": "Fillable",
> "ModDate": "D:20211012165530Z00'00'",
> "Producer": "macOS Version 10.15.7 (Build 19H1417) Quartz PDFContext",
> "Subject": "Request for Taxpayer Identification Number and Certification",
> "Title": "Form W-9 (Rev. October 2018)"
> }{code}
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