Object tag embedding PDF's not reliable for Internet Explorer

I've had several reports from users that pages with embedded PDF's aren't displaying the PDF and leave a blank space where it should be. I've managed to trace the issue to the <object> tag.

I've found two fixes that reliably solve the issue for all my users.

1. Switch the <object> tag for an <iframe>, although I understand this isn't valid for the HTML level Moodle wishes to comply with.

2. Add <param name="src" value="' . $fullurl . '" /> within the object tag. I'm not 100% sure if this is valid to the HTML level we want.

A fix or possibly even a configuration to switch the method used would be great.