The substance you're describing is likely a metal. Here's why:

* High Luster: Metals have a shiny, reflective surface that reflects light well, giving them their characteristic luster.

* Conducts Electricity: Metals have free-moving electrons in their structure, allowing them to easily conduct electricity.

* Malleable: Metals can be hammered or pressed into different shapes without breaking, making them malleable.

Examples of metals that fit this description:

* Gold

* Silver

* Copper

* Aluminum

* Iron

Let me know if you have any more questions!