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Moreover , as users collaborate and share through cloud services , these malicious files posing as PDFs “ fan out ” to shared users , creating a secondary propagation vector .
 phishing: posing as
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: phishing, data breach, ransom, discover vulnerability, patch vulnerability 
Text: {0} 
Answer:
 phishing: posing as