Get content from PDF

Here is one extension that uses pdf.js

\Tomcat 8.5\webapps\Thingworx\Common\extensions\ptc-thingview-extension\ui\thingview\js\ptc\thingview

contains pdf.js javascript extension.

https://github.com/mozilla/pdf.js/

Here is samples

https://mozilla.github.io/pdf.js/examples/index.html#interactive-examples

Searching thru Tomcat 8.5\webapps\Thingworx\Runtime\js\CombinedExtension...js

As noted in this community link https://community.ptc.com/t5/ThingWorx-Developers/Is-there-a-document-preview-widget-in-Thingworx/m-p/535582#M26123

you can also use WebFrame for displaying pdf