I would use Acorn's sub-site method, also using Scroll Vertically, but I would present it as an iFrame.
<iframe src="https://your-domain.com.au/sub-folder/"
width="100%" height="100%"
frameborder="0"
scrolling="auto" >
<p>Your browser does not support iframes.</p>
</iframe>
Create a placeholder using a Rectangle to suit the width and height you want your PDF to show. Your placeholder will act as a window to watch your PDF as you scroll by.
Paste the code in the HTML Code (Body) section of the placeholder.
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