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https://issues.apache.org/jira/browse/PDFBOX-5430?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17533921#comment-17533921
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Tilman Hausherr commented on PDFBOX-5430:
-----------------------------------------
Yeah we should refuse all these weird files, but the problem is that users
always have the winning argument "but it renders on Adobe Reader!".
> PDFStreamEngine.showTextStrings with font switch
> ------------------------------------------------
>
> Key: PDFBOX-5430
> URL: https://issues.apache.org/jira/browse/PDFBOX-5430
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 2.0.26
> Reporter: Oliver Schmidtmer
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 2.0.27, 3.0.0 PDFBox
>
> Attachments: keine Vorschau ELO-1228188_20220228_11462_HD_online.pdf
>
>
> The attached PDF fails to render with an PDFStreamEngine.showTextStrings with
> the following exception:
> "java.io.IOException: Unknown type COSName in array for TJ
> operation:COSName\{F3}"
> This seems to be a font switch.
> {code:java}
> diff --git
> "a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> "b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> index e4f2259a5..12edadd2b 100644
> ---
> "a/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> +++
> "b/pdfbox/src/main/java/org/apache/pdfbox/contentstream/PDFStreamEngine.java"
> @@ -680,6 +680,18 @@ public abstract class PDFStreamEngine
> byte[] string = ((COSString)obj).getBytes();
> showText(string);
> }
> + else if (obj instanceof COSName)
> + {
> + if(((COSName) obj).getName().startsWith("F"))
> + {
> + textState.setFont(resources.getFont((COSName) obj));
> + }
> + else
> + {
> + throw new IOException("Unknown type " +
> obj.getClass().getSimpleName()
> + + " in array for TJ operation:" + obj);
> + }
> + }
> else if (obj instanceof COSArray)
> {
> LOG.error("Nested arrays are not allowed in an array for TJ
> operation:" + obj);
> {code}
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