Hello Hussein,

The delivery of the malicious code totally depends on your social-engineering skills.

You can embed this tool in to PDF file and send it to the target via email. Check the article here: https://medium.com/purple-team/embedding-backdoor-into-pdf-files-1781dfce62b1

You can embed malicious code in to the image file and send it via email or messenger. Check the article here: https://medium.com/purple-team/hiding-msfvenom-backdoor-in-jpg-image-8fa9dd18c924

Or, you can create an infectious USB media and drop it on the targets desk, and let the human curiosity do the job. Check the article here: https://medium.com/geekculture/create-infectious-usb-cd-media-30fbac0289a4

The possibility is basically endless, you just need to use your imagination.