Archaeoattacus malayanus is one of the world's largest species and the largest Asian moth, with wingspan reaching up to 25 centimetres. The basic colour of the uppersides of the wings range from dark to pale brown, with a striking pattern of white markings. The undersides of the wings are similar to dorsal sides.

Females attract males by means of the scent produced by a gland located at the end of the abdomen. Larvae feed on Machilus, Prunus and Ailanthus species. At the first instar, caterpillars are white with black stripes, while the later instars are whitish and covered by dense waxy powder

They fly when the rain season starts in May, until October.