Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8899b2a56693a0…

MALICIOUS

PDF

45.2 KB
MD5: 789186bdc822a1a22b01ffc89d6249f1 SHA-1: 60a8a0a83b0a143b1183aef2072c677391790624 SHA-256: 4b8899b2a56693a01f3b9e2be83163cae69b401cb37d09c931a5fc1d7f2ec78f
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file exhibits characteristics of malicious intent, including the presence of obfuscated JavaScript and XFA form elements, as indicated by multiple heuristic firings. The ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' further supports this assessment. While the document body is unreadable, the embedded JavaScript stream is the primary indicator of malicious activity, likely serving to download and execute a secondary payload. The extracted URLs are related to XFA and Adobe, but their specific role in the attack is unclear without further analysis of the JavaScript.

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
539047bf0c540ae7268077da0989f758c1c86061b67fcba959dd5b50917cacd3		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1D5 3627 bytes

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