mmmm, si, creo que si debes buscar un host con esto:
Cita: minimum requirements: PHP 4.3.0 or higher, Ability to change the permissions of files and folders, PHP GD2, with JPG and TTF support, AFPL or GPL GhostScript 8.0 or higher, Adobe Acrobat Reader, GhostView 4.7 or higher
Cita: ... Si usa un servidor de Linux o de Unix que apoye el exec() y ps2pdf ....