<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<h2>Showing PDF in popup modal preview using Bootstrap Easy Modal Plugin</h2>
<button class="btn btn-default" type="button" data-toggle="dropdown">View
<span class="caret"></span></button>
<ul class="dropdown-menu dropdown-menu-right">
<li><a class="btn btn view-pdf" href="http://www.bodossaki.gr/userfiles/file/dummy.pdf">View PDF</a></li>
</ul>