Determining how embeded PDFs are displayed - Possible?

When placing a PDF as a Web-Object in a Captivate-Screen and Export for HTML5 it seems that the Browser (and the configuration of his plugins) determinates how the PDF is displayed. In my case in Firefox it is centered, in Crome it is placed at the upper left. In both cases it seems scaled in a way that let spaces on the left and right (or in the case of Crome only at the right) when a letter/Din-A4-Document is shown in an area in landscape-format.

The specifications made in the PDF itself are overwritten, a PDF is displayed in the same way regardless it should be shown "as a whole" (I mean the whole document with no scrolling on a single site) or in its whole with (I mean that there are no spaces at the right or left and you can scroll the document).

Is there a possibillity to determine this in Captivate or by modifying the HTML5-Output?

It seems the answer is "no" but I what to be sure about this.

Still using Captivate 8