pdf2dcm: 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/pdf2dcm - from package: dcmtk

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

Error in other languages:
pdf2dcm: bevel nie gevind nie
pdf2dcm: comandă negăsită
pdf2dcm: comando não encontrado
pdf2dcm: commande introuvable
pdf2dcm: command not found
pdf2dcm: käsku ei ole
pdf2dcm: không tìm thấy lệnh
pdf2dcm: komanda nerasta
pdf2dcm: Kommando nicht gefunden.
pdf2dcm: kommandot finns inte
pdf2dcm: komut yok
pdf2dcm: nie znaleziono polecenia
pdf2dcm: níor aimsíodh an t-ordú
pdf2dcm: no se encontró la orden
pdf2dcm: no s'ha trobat l'ordre
pdf2dcm: opdracht niet gevonden
pdf2dcm: parancs nem található
pdf2dcm: perintah tidak ditemukan
pdf2dcm: príkaz nenájdený
pdf2dcm: příkaz nenalezen
pdf2dcm: команда не найдена
pdf2dcm: командата не е открита
pdf2dcm: 命令找不到
pdf2dcm: コマンドが見つかりません