Email spam attachments decreasing

BitDefender labs have determined that the number of spam messages sent to recipients with PDF attachments has recently decreased. Their researchers believe this decrease can be attributed to the relative ineffectiveness of this spamming method, as it requires more user interaction than usual e-mail spam.
 
“We detected a peak in this type of spam about two weeks ago, but the whole wave was relatively short-lived,” declared Vlad Valceanu, head of BitDefender’s antispam lab. “End users are finally becoming skeptical to opening email attachments from sources not familiar to them. As a result, it appears spammers are giving up on this tactic.”
 
The PDF spam wave was mainly comprised of fake stock tips, supporting penny stock “pump-and-dump” schemes. It raised concerns in the corporate world because text-based antispam solutions could not accurately filter such content, while blocking PDF attachments at the corporate gateway was definitely not an option.
 
“While spammers are sending out fewer attachments with their emails, we don’t expect to see a dramatic decrease in the overall amount of spam distributed,” added Valceanu. “Our research has simply found that spammers are finding newer, more productive methods in their delivery of spam messages. PDF spamming will likely cease to represent a significant percentage of the spam flow in the weeks and months to come.”