Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e0f6816cf233c4…

MALICIOUS

PDF

32.9 KB
MD5: edd4a5aa14e2cee52913944f1dd4515a SHA-1: 8dd78cc12f47fc691e6c3fd69b4f202c7fdd60d4 SHA-256: 82e0f6816cf233c4340eb1c82ae3d0720427706c525c924fc30de8864d20e1ce
276 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains obfuscated JavaScript that is designed to load and execute an embedded Flash file (SWF). The SWF file is identified by ClamAV as an exploit kit, indicating it likely exploits a vulnerability in the Flash Player. The combination of PDF obfuscation, embedded JavaScript, and an exploit-laden SWF strongly suggests a malicious document intended to exploit a client-side vulnerability upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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
OmWnJMiadRByWBJ.swf
82959a74bd2f365dbaff0af8a126e8d6efed63f658723f179f7020ea3628ed8b		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x1505 27931 bytes
Detection
ClamAV: Swf.Exploit.Kit-513
Obfuscation or payload: likely
Carved artifact entropy is 7.99, consistent with packed or encrypted content.
javascript_obj0006_000.js
6bb77e8c00455e5ebfb4a71aff98097abd23832a020e188087148b509fb95cc4		 pdf-javascript-stream PDF /JS object 6 at offset 0x13C 3699 bytes

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