PDF documents using the Courier Font appear blank in the File Preview

Problem

When using the View File macro, the File Previewer for Word/PDF documents that use the Courier Font is shown as blank. 

Environment

• Confluence 7.17.4
• Linux OS 

Steps to Reproduce

• Create a PDF document using the Courier Font
• Upload the document to a Confluence Page 
• Click on the previewer to see the file

Expected Results

The content of the file to be accurately displayed

Actual Results

A blank page is displayed

Workaround

Use the PDF Macro