cdfmax: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/cdfmax - from package: cdftools

You may install the required package with command apt-get install {package}

Error in other languages:
cdfmax: bevel nie gevind nie
cdfmax: comandă negăsită
cdfmax: comando não encontrado
cdfmax: commande introuvable
cdfmax: command not found
cdfmax: käsku ei ole
cdfmax: không tìm thấy lệnh
cdfmax: komanda nerasta
cdfmax: Kommando nicht gefunden.
cdfmax: kommandot finns inte
cdfmax: komut yok
cdfmax: nie znaleziono polecenia
cdfmax: níor aimsíodh an t-ordú
cdfmax: no se encontró la orden
cdfmax: no s'ha trobat l'ordre
cdfmax: opdracht niet gevonden
cdfmax: parancs nem található
cdfmax: perintah tidak ditemukan
cdfmax: príkaz nenájdený
cdfmax: příkaz nenalezen
cdfmax: команда не найдена
cdfmax: командата не е открита
cdfmax: 命令找不到
cdfmax: コマンドが見つかりません