Answer
No, the 2007 cyberattacks on Estonia do not fit the definition of cybermalware.
Work Step by Step
In 2007, the Estonian government, banks, news organizations, and other institutions were under numerous cyberattacks that started on April 27, 2007, and lasted for about three weeks. The real trigger for these attacks was the decision by the Estonian government to relocate a Soviet war monument, the Bronze Soldier, from downtown Tallinn to a military cemetery.
The attacks on Estonia were primarily distributed denial-of-service (DDoS) attacks, which do not involve the use of malware. Instead, DDoS attacks overwhelm targeted systems with excessive traffic, rendering them inaccessible. So Estonia do not fit the definition of cybermalware.
