Relevant parts:
Partner represents and warrants that it shall not introduce into WhatsApp’s Systems or Infrastructure, the
Sublicensed Encryption Software, or otherwise make accessible to WhatsApp any viruses or any software
licensed under the General Public Licence or any similar licence (e.g. GNU Affero General Public License
(AGPL), GNU General Public License (GPL), GNU Lesser General Public License (LGPL)) containing a
"copyleft" requirement during performance of the Services.
Partner shall not: (i) combine Sublicensed Encryption Software with any software licensed under any version
of or derivative of the GNU General Public License (e.g.; GNU Affero General Public License (AGPL), GNU
General Public License (GPL), GNU Lesser General Public License (LGPL) in any manner that could cause, or
could be interpreted or asserted to cause, the Sublicensed Encryption Software or any modifications to the
Sublicensed Encryption Software to become subject to the terms of any version of or derivative of the GNU
General Public License or other copyleft open source software
The technical definition of a "computer virus" is actually quite narrow, and true viruses are rare these days because they are passive and slow compared to more modern malware types.
A strict, literal reading of the text says that all other kinds of malware are acceptable.
Paragraph 3.1.5. expands on that though: