Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c9903058fe08b8…

MALICIOUS

PDF

31.8 KB
MD5: 02bcc63828908ee59524b2f61349f080 SHA-1: d04c9eac6de17ad30a350e6c534958dd947a0153 SHA-256: f5c9903058fe08b86868195bb4242fb20fe1520f303d048285f39a013ea76a6e
216 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious Attachment T1027 Obfuscated Files or Information T1027.006 Obfuscated Files or Information: Compiled HTML

The PDF contains embedded JavaScript and a RichMedia (Flash) object, which is highly suspicious. Static analysis detected a ClamAV signature 'Pdf.Exploit.Agent-35955' on both the PDF and an extracted artifact named 'cdpMAvvyB.swf'. This indicates the PDF is designed to exploit vulnerabilities and execute the embedded Flash content, likely to download and run further malicious payloads.

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.

FilenameKindSourceSize
cdpMAvvyB.swf
c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1532 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
1512413d2c79db7735d92f8708d673ba8d885862d8d94074a202ad501e469f69		 pdf-javascript-stream PDF /JS object 6 at offset 0x142 3716 bytes

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