Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1145f07c38373a…

MALICIOUS

PDF

31.9 KB
MD5: b3db066846acbfa7f81cb7838b7b4382 SHA-1: 7239adb479bd2ee65104ff19bf9c9f5822415ccb SHA-256: 8b1145f07c38373ab82b3d6f0dbc47ad26721a2477e0f14006c2fc33a8f77dc6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1559.002 Component Object Model Hijacking

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and a Flash object. The ClamAV heuristic 'Heuristics.PDF.ObfuscatedNameObject' strongly suggests malicious intent. The presence of these embedded artifacts, particularly the SWF file and JavaScript stream, indicates a likely attempt to execute arbitrary code or exploit vulnerabilities within the user's system.

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
JhCsUXwXrduOq.swf
9e798ca759049b0ed1720d8ee720e7d781cde4ef09bae49b100d9fd2551e8f75		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1539 26849 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
4c275d3f152873dffe62e99c6f7ab55e887b8d4f233dfd03b335afb1230bc714		 pdf-javascript-stream PDF /JS object 6 at offset 0x140 3736 bytes

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