Issue Summary

Currently, when attempting to open an XFA-PDF using Confluence's built-in PDF viewer, users encounter the following message:

"Please wait... If this message is not eventually replaced by the proper contents of the document, your PDF viewer may not be able to display this type of document. You can upgrade to the latest version of Adobe Reader for Windows®, Mac, or Linux® by visiting http://www.adobe.com/go/reader_download. For more assistance with Adobe Reader visit http://www.adobe.com/go/acrreader. "

Steps to Reproduce

1. Generate any XFA-PDF file.
2. Attach it to a Confluence page.
3. Try to view the PDF within Confluence

Expected Results

The PDF displays correctly within Confluence, allowing users to interact with its contents as intended.

Actual Results

Instead of displaying the content, the PDF viewer shows an error message, indicating its inability to render XFA-PDFs.

Workaround

As a temporary solution, users can convert the XFA-PDF to a standard PDF format (flattened PDF) to attach it and view it in Confluence. However, this may result in the loss of interactive features present in the original PDF.