In Linux I think we need mozplugger plugin for viewing pdf files. I just removed and installed mozplugger again (Reference links: http://www.tootips.com/2013/01/how-to-open-pdf-files-inside-chromium.html, http://mozplugger.mozdev.org/ ) and now it seems to work.

In windows we need to install a system pdf reader like acrobat (http://www.adobe.com/in/products/reader.html), as chromium downloads and displays pdf with system PDF viewer (Reference link: http://code.google.com/p/chromium/wiki/ChromiumBrowserVsGoogleChrome).

An alternative solution is to open the pdf link in default browser with help of node.js using below script.

Install the node.js open module:

$ npm install open

use:

var open = require('open');

open('http://www.google.com', function (err) {

  if (err) throw err;

  console.log('The user closed the browser');

});

Reference link: How to use nodejs to open default browser and navigate to a specific URL