Embed pdf document and enable scroll to submit

Question

Good morning, I would like to embed a pdf document on my website for a PHP registration form, in which after pulling the scroll to the end of the pdf, the commit button is activated. Here’s the code, I’m using jquery to find the scrool state, but I’m not getting it.

echo '<embed src="ficha.pdf" width="600" height="200" type="application/pdf"  class="pdfrender">';

//jquery

$(".pdfrender").on("scroll", function(){ alert("OK");   });