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The SANS Internet Storm Center published a warning on Wednesday about an active phishing campaign that utilizes PDF attachments in a novel ploy to harvest email credentials from victims .
 ( phishing: phishing campaign,  utilizes PDF attachments: attack pattern, Wednesday: time, a novel ploy: trusted entity, harvest email credentials: purpose, victims: victim) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: phishing, data breach, ransom, discover vulnerability, patch vulnerability, Arguments type: vulnerable system, capabilities, vulnerability, number of victim, issues addressed, compromised data, damage amount, common vulnerabilities and exposures, victim, patch number, number of data, tool, discoverer, time, purpose, place, payment method, releaser, vulnerable system version, attacker, supported platform, patch, price, vulnerable system owner, trusted entity, attack pattern. 
Text: {0} 
Answer:
 ( phishing: phishing campaign,  utilizes PDF attachments: attack pattern, Wednesday: time, a novel ploy: trusted entity, harvest email credentials: purpose, victims: victim) 