Malicious PDF — malware analysis report

Static analysis result for SHA-256 a42102c4cd39a775…

MALICIOUS

PDF

45.2 KB
MD5: 838fb8c84958ec4baa7ae37c7b12df97 SHA-1: b38a7bc8a57fe4fcf8e4b053a29df73ea518aa11 SHA-256: a42102c4cd39a775f445753f16ea8cd1051be8ffb0e21deb1ed0f0716d1fb8c5
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further suggests malicious intent. While the document body is heavily obfuscated and unreadable, the presence of JavaScript points towards an attack pattern involving the execution of arbitrary code. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, though its exact function cannot be determined due to obfuscation. The provided URLs are related to XFA forms, which are often exploited in PDF-based attacks.

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
56665d2c35b941412ae83fdb121dff3c369622dc521637d1edb991067835222c		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1ED 3366 bytes

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