Malicious PDF — malware analysis report

Static analysis result for SHA-256 73aa5c0819804fc9…

MALICIOUS

PDF

8.0 KB
MD5: a14600b2e53d52546815ec1ce4440cc0 SHA-1: 9199f82805a30b151baab13fd30809a7652dd5a8 SHA-256: 73aa5c0819804fc91ea1d6700bebdbb80a772d0435bd3fdd6236860b02d1901c
214 Risk Score

Malware Insights

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

The PDF sample contains obfuscated JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. The embedded JavaScript, despite being heavily obfuscated, likely aims to download and execute a secondary payload. The presence of a SWF file further suggests a multi-stage attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
7EcltJ.SWF
49b04eca9be01c285a55c8ebf6d33b686ebd88925f5f524951dc74928b300173		 pdf-embedded-file PDF EmbeddedFile object 16 at offset 0xFDD 3764 bytes
javascript_obj0006_000.js
abaeb70aa11d7899be64f98673e9f3842d79e07702000a068ccb640257bf96db		 pdf-javascript-stream PDF /JS object 6 at offset 0x146 1555 bytes

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