The final artwork will be like below....
Creating Paper with shadow
First create a background as like as below with radial gradient.
Then create a simple gray rectangle above it.
Take the ellipse tool and create an ellipse. Fill it with full black. Then Go to EFFECTS > BLUR > GAUSSIAN BLUR and make the radius to 36.0 pixels.
Copy the item and paste two times besides the paper. Select both items and press CTRL + [ to send back.
Creating the arrow icon
Create an arrow icon and a rounded rectangle and give them below gradient.
Move them at the corner of the gray paper. Select the rectangle and press CTRL+[ to send back.
Finalizing the work
Now we have to make a shadow to make a real artwork. Copy the arrow by pressing ALT key and fill it with black. Go to EFFECT > BLUR > GAUSSIAN BLUR and make the radius to 36.0 pixels. Then move the shadow behind the arrow. You can change the opacity of the shadow.
You are all set. Your work will be as like as below.