Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee81e11128c9f7f…

MALICIOUS

PDF

28.6 KB
MD5: 904f55d2350e84952154f5d8fb3df8bf SHA-1: 97278150ded5a6c95834ed831611ec037708cb4b SHA-256: 7ee81e11128c9f7fe4b81a596993cb47a06343bcd1c1a9e196a4ba9c5d1bc1b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits multiple indicators of malicious activity, including embedded JavaScript and a Flash object (KOuKWkxlCLGrA.swf). The presence of obfuscated JavaScript and the ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' strongly suggest an attempt to conceal malicious code. The embedded Flash file is a common vector for exploiting browser or plugin vulnerabilities.

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
KOuKWkxlCLGrA.swf
767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0x76B 26993 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.98, consistent with packed or encrypted content.
javascript_obj0006_000.js
18ae0e9b1819e216500e78da491022aacfb43fe38795dfb8b653aa94dc0e7a3f		 pdf-javascript-stream PDF /JS object 6 at offset 0x15B 303 bytes

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