Lets do it,
Create a webblock and use it to:
In preparation does download of binaray (save=no).
Create a new page, reuse the webblock and create div checkbox.
Use Js to manipulate view, e.g: Expand the size of iframe to max, hide the scrollbar, when in bottom of page show the div checkbox.
or Use iframe, or a forge components to view PDF and, the same reasoning.
https://www.outsystems.com/forums/discussion/45596/how-to-open-pdf-in-new-tab/
https://www.outsystems.com/forums/discussion/46300/pdf-view-in-web-application/