PDF Viewer is a special "CK Editor" button, created for Invision community platform. with this editor button you can display "PDF files" through links in your posts or any other places that works with CKEditor throughout your community.
Installation: In ACP go to Customization > Editor > Toolbars and click on Add Button > Upload "pdfview.zip" and Save
Important Note: Usage of this plugin require to grant "post HTML" permission to user groups.