Assuming that you have a PDF in your controller as a byte array, add the following code to convert the data to a base64 string and send to your view.
string imageBase64Data = Convert.ToBase64String(results);
string imageDataURL = string.Format("data:application/pdf;base64,{0}", imageBase64Data);
ViewBag.ImageData = imageDataURL;
In your view, display the PDF in an iframe.
<div class="container">
<div class="row">
<div class="form-group-sm">
<div class="col-md-12" style="padding-left: 0px;">
<iframe style="width: 75%; height: 500px;" src="@ViewBag.ImageData"></iframe>
</div>
</div>
</div>
</div>