Cognitive and cultural embeddedness: combining institutional economics and economic sociology
According to this, pederasty is sexual relations between two males, especially when one of them is a minor. Other definitions, like the one that JSBangs found, differ slightly. But otherwise, I think you answered the question yourself: pedophile refers to the attraction, while pederasty refers to the act itself.
Medical Definition of PED. : a performance enhancing drug : a substance (such as an anabolic steroid or human growth hormone) that is used illicitly especially to improve athletic performance.