PDF Embed Shortcode (For Wordpress); just include this in your functions.php file

pdf-embed-shortcode.php

<?php // TODO: put this in your functions.php file and use on a page like [pdf]/path-to-your/file.pdf[/pdf] ?>

<?php
function pdf_embed_shortcode($attrs, $content) {

	$pdfPath = $content;
	if ( wp_is_mobile() ) {
		$htmlStuff =
		'<div style="text-align:center;"><p id="mobilefallback">This browser does not support native PDF embeds or you are on a mobile device. Please <a href="' . $pdfPath . '" target="_blank">download</a> the PDF instead.</p>
		<p class="pdfDownload"><a class="btn btn-primary btn-md" href="' . $pdfPath . '" target="_blank">Download</a></p></div>';
	} else {
		$htmlStuff =
		'<div id="pdfViewer">
			<object class="pdfObject" data="' . $pdfPath . '" type="application/pdf" width="100%" height="100%">
				<iframe src="' . $pdfPath . '" width="100%" height="100%" style="border: none;">
					This browser does not support PDF embeds.
					Please <a href="' . $pdfPath . '" target="_blank">Download PDF</a> instead.
				</iframe>
			</object>
			<p class="pdfDownload"><a class="btn btn-primary btn-md" href="' . $pdfPath . '" target="_blank">Download</a></p>
		</div>';
	}

	return $htmlStuff;
}
add_shortcode( 'pdf', 'pdf_embed_shortcode' ); 

// minor css and you got yourself a nice little PDF with fallback and a neat lil' download button

// example use: [pdf]/wp-content/uploads/2018/01/just_another.pdf[/pdf]

?>