The code sample I was looking at utilized Acrobat Reader as an Active X object using object tag with callsid:
<OBJECT id="Object1" style="WIDTH: 784px; HEIGHT: 592px" classid="clsid:CA8A9780-280D-11CF-A24D-444553540000"
VIEWASTEXT>
<PARAM NAME="_cx" VALUE="26035">
<PARAM NAME="_cy" VALUE="15663">
</OBJECT>