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https://issues.apache.org/jira/browse/PDFBOX-5878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17880141#comment-17880141
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Michael Klink edited comment on PDFBOX-5878 at 9/8/24 1:59 PM:
---------------------------------------------------------------
As an aside: The document has set *NeedAppearances* to *true*, so regenerating
the appearances for flattening would be appropriate here whether there are any
issues in the PDF or not.
Furthermore, when (re-)creating form field appearances, one should always
create from scratch. The only exception may be if one has analyzed the existing
contents and has made sure that one has removed all old field contents from it
and also that there is nothing in it that moves the to-be-drawn new content out
of the bbox or otherwise obscure it. Else this might be a variation of one of
the well-known www.pdf-insecurity.org attacks. But I think it in general is
really hard to tell whether some "rectangles and such" are drawn as part of a
specific style or as an forgery attempt. Thus, I'd really propose to always
re-create from scratch.
was (Author: mkl):
As an aside: The document has set **NeedAppearances** to **true**, so
regenerating the appearances for flattening would be appropriate here whether
there are any issues in the PDF or not.
Furthermore, when (re-)creating form field appearances, one should always
create from scratch. The only exception may be if one has analyzed the existing
contents and has made sure that one has removed all old field contents from it
and also that there is nothing in it that moves the to-be-drawn new content out
of the bbox or otherwise obscure it. Else this might be a variation of one of
the well-known www.pdf-insecurity.org attacks. But I think it in general is
really hard to tell whether some "rectangles and such" are drawn as part of a
specific style or as an forgery attempt. Thus, I'd really propose to always
re-create from scratch.
> pdf form field text gets blurred after flattening
> -------------------------------------------------
>
> Key: PDFBOX-5878
> URL: https://issues.apache.org/jira/browse/PDFBOX-5878
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.28, 3.0.3 PDFBox
> Environment: Mac Ventura, java 18 PDFBox 3.0.3, Tomcat 9
> Linux; version: 5.15.0-105-generic, java 17, Tomcat 9.0.93
> Reporter: Joseph Jezerinac
> Priority: Major
> Labels: Appearance
> Attachments: Bildschirmfoto vom 2024-09-05 10-07-13.png,
> PDFBox5878-flattened.pdf, PDFBox5878-saved.pdf, beforeFlattening.pdf,
> flattened.pdf
>
>
> After flattening a pdf acro form, value of some fields get blurred
> {code:java}
> PDDocument pdDocument = Loader.loadPDF(inFile, "");
> pdDocument.setResourceCache(new DefaultResourceCache());
> try {
> boolean save = false;
> if (pdDocument.isEncrypted()) {
> pdDocument.setAllSecurityToBeRemoved(true);
> save = true;
> }
> final PDDocumentCatalog pdDocumentCatalog =
> pdDocument.getDocumentCatalog();
> if (pdDocumentCatalog != null) {
> final PDAcroForm pdForm = pdDocumentCatalog.getAcroForm();
> if (pdForm != null) {
> pdForm.flatten();
> save = true;
> }
> }
> if (save) {
> pdDocument.save(outFile);
> }
> }
> catch (Exception e) {}
> {code}
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