pamflet

1. lampoon; polemical pamphlet
   Napisao je oštar pamflet protiv vlade. — He wrote a scathing pamphlet against the government.
2. derog. (of a book, film) crude propaganda piece
   Kritičari su film nazvali političkim pamfletom. — Critics called the film a piece of political propaganda.

Unlike English pamphlet, it usually has a polemical or negative tone; an informational booklet is brošura, and a leaflet is letak.