The pencils represent art and education, and the terrorists represent the Islamic ideology of IS/ISIS/ISIL being against the art of drawing. If this cartoon were intended primarily as "education fighting back in the Islamic-fascist war against education," then perhaps that could be implicitly drawn from how students typically start their school year with a review of their school supplies in which pencils tend to figure prominently.
How do you interpret this image? (There's no "wrong answer" because art is interpreted freely and independently by each individual.)
(Thank you to +Robert Niles
for re-sharing this image originally.)