If you are in need to scan a document and do not have all the tools from your office, there is no need to worry if your iPhone is nearby. Use the Apple notes application to do it.
Just hold down the Apple notes button until you get a pop-up menu.
Select scan document, and center your document in the screen view, click as if you were taking a photo, after that you can save the scan or scan more pages.
Once you have the saved scan it will appear on your notes as scanned document and you can rename it to whatever you want or share it.