Batcher

@echo off
for /f "delims=" %%a in ('dir /a-d/b *.pdf') do (
    set "filename=%%~na"
    set "file=%%a"
    for /f "delims=" %%b in ('dir /ad/b') do (
        set "foldername=%%b"
        setlocal enabledelayedexpansion
        rem !filename:~0,4!
        rem !foldername:~12,4!
        if "!filename:~0,4!" equ "!foldername:~12,4!" (
            echo;"!file!" --^> "!foldername!"
            move "!file!" "!foldername!/!file:~4!"
        )
        endlocal
    )
)
pause