Hello,
It should work. Please make sure you use an absolute URL for the SVG image.
You can try it out using our online conversion form. Paste the following code here
http://pdfcrowd.com/#convert_by_input and hit the [Convert to PDF] button
<object type="image/svg+xml"
data="https://upload.wikimedia.org/wikipedia/commons/1/15/Svg.svg"
style="height:639px; width:846px; position:absolute; z-index:200">
</object>