It's an adverb participle, a perfect participle.

这是一个副词从句，也是一个完成时从句。

Now, the most common one, and this is probably the most difficult structure, I guess, you could call it for a lot of people is the perfect participle.

那么，最常用的一个，也可能是最难的一个结构，我猜，你可以像大多数人一样把它称作完成分词。

" Having heard" is a perfect participle phrase, which is used to indicate that an action (hearing the good news) was completed before another action (being filled with joy).

“听见” 是一个完成分词短语，用来表示一个动作（听到好消息）在另一个动作（充满喜悦）之前完成。