PDF in iFrame zoom level

I have an iFrame that loads a PDF onto a Lectora page. The PDF is not on an external site, but contained within the lesson via the Additional Files tab (i.e. source = myFile.pdf as opposed to source = http://www.pdfzone.com/myFile.pdf).

Anyone know of a way to have the PDF file open at a set zoom size? I know the user can control the default zoom of PDFS, and know how to control the zoom of PDFs loaded from external sites, just not sure you can do it from within an iFrame.

Thanks,

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