It's pretty common, it means wealth but it can also mean money in some contexts and sometimes it refers to what one owns in general.
مال وأعمال = Finance and Business
يجب المحافظة على مال اليتيم = An orphan's wealth should be maintained
لا أحمل مالا كافيا لشراء شيء الآن = I don't carry enough money to buy anything right now
رأس مال الشركة يبلغ كذا = The company's capital is so and so
أنت ومالك لأبيك = You and what you own belong to your father