Digital signature in PDF is not visible when previewed in JIRA

Issue Summary

JIRA attachment preview doesn't show digital signature in a PDF file.

Steps to Reproduce

1. Attach a PDF with a digital signature to an issue (Sample PDF: SampleSignedPDFDocument.pdf)
2. Click on the PDF to open it in preview

Expected Results

You see the PDF contents and the digital signature

Actual Results

You see the PDF content without the digital signature

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available