A useful tool in Kali is objdump. Objdump is a quick disassembler that can show the contents of object files.
Below is a screenshot example of its use:
objdump -D -M intel [filename] instructs the utility to Disassemble an object file and provide us output in intel format (as opposed to AT&T format.)
The output here is in several columns. Assembly is listed on the right side of the screen. It is seem with instructions like:
mov eax, 0x1
add rax, 0x1
To the left are the hex value equivalents of the assembly code. While we write in assembly, the hex values are what the processor will digest and understand.