In some countries you are strongly obligated to make contact with illegal images know to the authorities. Failing to do so is punishable.
Such an attack is as trivial, as annomously sending illegal material to the target, depending on the country. There are thousand of cases of minors sending nudes and causing legal investigations. You find articles of parents sending pictures to doctors and being banned from online services, which are known.
Other social attacks, such as giving out free USB sticks with incriminating material are thinkable. Allthoug I am not aware of this being proven to have happened, one can find cases where people used this as a defense.
People providing free uncensored internet by running a Tor node are known to have lots of legal troubles because of it, with different severity depending on the country. Even making it to no flight lists.
Illegal pictures might not be viewed by the public. A government could just claim they found them on your device and may have a way to exclude them to be viewn by anyone. So an individual may have to start a defense from the fact that illegal material has been found on a device, without a chance to ever see the image. Again depending on the country and legal system, there might not even be a need for those illegal pictures to actually exist. Here a document from a governmental entity suffices.