Step 1: Upload a file into Google Drive (https://drive.google.com/)
1. Login to Gmail
2. Open Google Drive.
3. Click on Upload Icon -> Files -> Choose File From System.
Step 2: Change the Share Properties to make a file from "Private" to either "Public on the web" or "Anyone with the link"
1. Right click on the file name and Open with -> Google Drive Viewer
2. In the menu bar, click on File -> Embed this PDF File -> Copy the CODE
Step 4: Go to Blogger and Create / Edit a Post. Open the post description editor in HTML mode and Paste the Embed Script.