
Combinations indicating a native would be subjected to black magic are:
1] Bādhakeśa associating with the 6th House or Lord; or
2] 6th Lord in 1st, 7th, or 12th house as Mars occupies or aspects Lagna; or
3] Ketu in 1st, 4th, or 10th House as Mars occupies or aspects Lagna.
Example Chart:

This is the chart of a client of mine. There are 2 combinations of abhichara/black magic.
1] Bādhakeśa Saturn is in the 6th House.
2] Ketu is in the 10th House while Mars is aspecting Lagna.
The native’s legs developed severe swelling which made mobility pretty difficult. [Saturn affects legs]. Health in general was also affected with fever, sleeplessness, headaches. The native could feel some negative energy around him/her especially at night. Mars-Ketu are also causing Piśācha Bādhaka.
Appropriate mantras were given for removal of black magic & subsequent protection from it. Everything is fine now. Om Gurave Namah.