On each of those 8 occasions do you recall seeing a window popup saying this post might be held by moderators to check for moderation? Some sites we moderate & the site you hosted the image at is one of those.

You need to remember not all anti virus programs can detect all viruses. BCOOL found one that can detect this particular one & deal with it.
Some AV programs are slow or might never add a specific virus definition to their program. Some of the reknown AV programs might be 6-12 months before waking up or again, never add a particular definition.

Different AV programs might use a different name for the same virus.