On Bereishis 27:27, Rashi makes the following comment:
כריח שדה אשר ברכו ה'. שֶׁנָּתַן בּוֹ רֵיחַ טוֹב וְזֶהוּ שְׂדֵה תַּפּוּחִים, כָּךְ דָּרְשׁוּ רַזִ"לִ:
The Artscroll Chumash Rashi set comments in a footnote (don't have the exact text in front of me) that this could be a reference to a Kabbalistic notion.
This got me thinking: Is there any information/indication about whether Rashi engaged in the study of Kabbalah?