pdfedit: command not found

Have You tried accessing the binary with the full path?

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 CentOS possible default full paths are:

/usr/bin/pdfedit - from package: pdfedit

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