The phrase touch-based Malediction appears on page 20 of GURPS Psionic Powers.

When applied to an ability that works as a touch-based Malediction
(e.g., Mind Probe, Neutralize, and Possession),
this enhancement does not turn it into a true ranged attack.
Instead, it becomes a Malediction that uses standard range

penalties (p. B550).

B106 designs Malediction to work with ranged abilities with 3 tiers:

100 is -1/yard like a Regular spell
150 is B550's Size/Speed range table
200 is B241's Long Distance

In this case Ranged changes these 3 abilities into the 150% middle tier.

To reduce it to the 100% version would require Short Range -10%