Read out loud only speaks numbers and symbols rather than content

I am having trouble with a PDF document and the Read Out Loud feature. Read out loud works for other documents. This PDF file particularly only speaks a series of numbers and symbols such as "*#6%#$" ...etc.  The content is words. 

Can anyone tell me what is different with this PDF and if I can do something that allows me to use the Read Out Loud feature?  Thanks

Under the Description tab it says PDF is not tagged. I went through the assistant setup and the Change Reading Options of Current Document to "Infer Reading Order from document" and "Read the entire document" selected.  It then processed the document.

Security Tab-

Security Method: No Security

Can be Opened by: All versions of Acrobat

Printing: Allowed

Document Assembly: Not Allowed

Content Copying: Allowed

Content Copying for Accessibility: Allowed

Page Extraction: Not Allowed

Using Adobe Acrobat Reader DC

Version 2017.009.20044

On MacOS Sierra Version 10.12.3