Acryptolechia malacobyrsa is a moth in the Depressariidae family. It was described by Meyrick in 1921. It is found in Japan, Korea, China (Fujian, Henan, Jiangxi, Shaanxi, Sichuan) and Taiwan. The wingspan is about 19 mm. The forewings are deep yellow-ochreous, sprinkled rathor dark purplish-fuscous and with some purplish-fuscous suffusion towards the dorsum anteriorly. There is an oblique oval purplish-fuscous spot representing the first discal stigma and a somewhat oblique slender purplish-fuscous fascia from beyond the middle of the costa to the dorsum before the tornus. There is a marginal series of small purplish-fuscous spots around the posterior part of the costa and termen. The hindwings are grey, paler towards the base.