@echo off
cd /d "%~dp0"
for /f "delims=" %%i in ('dir /b /ad') do (
    echo %%i
    pushd "%%i"
    for /f "delims=" %%j in ('dir /b /a-d *.pdf') do (
        echo     "%%j" ---^> "%%i%%j"
        ren "%%j" "%%i%%j"
    )
    popd
)
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