Looking for a Very Specific Adjective
Perhaps guileful or Machiavellian.
guileful (from Wiktionary, 2019):
Full of guile; treacherously deceptive.
with guile being (from Wiktionary, 2019):
Astuteness often marked by a certain sense of cunning or artful deception.
Machiavellian (from Wiktionary, 2019):
Attempting to achieve goals by cunning, scheming, and unscrupulous methods, especially in politics or in advancing one's career.