This application just easy the task of converting a PDF file to images + an HTML page that can you view in the 3DS browser.

If you have an Dropbox account and its Windows client installed, viewing a PDF in your 3DS is just a matter of dragging the PDF into the program, and then it will create a .html page, put it in your Dropbox public folder, grab the public URL, and optionally get a Bitly shorted link. So you get the URL, put it in your 3DS browser, and you can now view the PDF rendered as image files.

This is a preview version, it is almost done, but I just wanted to publish it before I do the final adjustments

Download WebPDF Preview
Source- gbatemp

Requirements:
-Windows 7
-Preferentially with glass ON
-Dropbox client (optional)