<a href="sample.pdf" download="Sample-File">Download PDF</a>
So when you will click on pdf file link, file will automatically download on your local system.
You will only need to define the name of PDF under "download" property of <a> tag like given in sample code.
Download the PDF without using jQuery/JavaScript or PHP code
Normally when we click on the pdf file link it is open in browser instead to download it on our local system. So if you want to force to download the pdf on local system instead to open into browser then you can do it very easily.
I am here explain you helpful trick to download the pdf without knowledge of JavaScript or PHP.
So trick is that HTML5 has providing <a> tag attribute "download" property to force to download the pdf file on your local system.