In iOS8.0 you will see a blank page below.This PDF is embedded in a HTML page.
In iOS 7.0 or earlier you will see the PDF below. There was no problem before this update.
In iOS8.0 as well you will see a PDF if the PDF is directly linked like this (hello.pdf).
Update: (April 9, 2015) With iOS 8.3 if the PDF has only a single page like below, thePDF can be displayed correctly.
But with iOS 8.3 as well if the PDF has 2 pages or more like this(embed2.html), only the first page is displayed when the PDF is embedded in a HTML page.