PDF malware analysis — malicious · 21b979617cace8f9

MALICIOUS

PDF

31.5 KB

MD5: dead697fe0b3ed216afdb35db4e87b47 SHA-1: 2b80329c74a27d8636439112a0567ec4b06bf11a SHA-256: 21b979617cace8f9358ca026271591e745c0d9a25a6e34cc66c368349478c35c

216 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Exploit.Agent-35955, indicating a known exploit. Static analysis revealed embedded JavaScript and a RichMedia (Flash) object, both of which are commonly used to deliver malicious payloads. The embedded Flash file, WHYxWcHbyGamOYF.swf, is highly suspicious and likely contains the exploit code. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

Heuristics 7

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`WHYxWcHbyGamOYF.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x13DB	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `6e53020d716c3558a4fc2386d4020d02fabee3657bca5a3942074498eaf51e03`	pdf-javascript-stream	PDF /JS object 6 at offset 0x132	3428 bytes

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