Malicious PDF — malware analysis report

Static analysis result for SHA-256 e70fa40a8e6e38d9…

MALICIOUS

PDF

7.8 KB
MD5: c8d10aea7fb7ff7e75499a1b584f8c1d SHA-1: 2c76cbcb42385b6c085fa923a4d8a15bc7870f8d SHA-256: e70fa40a8e6e38d9cb381b303520aa385f2fc108aec15f14e4d2a10f55dc7695
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file exhibits multiple heuristic firings related to embedded JavaScript and obfuscated objects, indicating malicious intent. The presence of embedded JavaScript streams, particularly one marked as a decompressed script payload, strongly suggests the execution of arbitrary code. While the document body is largely unreadable, the critical ClamAV detection for 'Heuristics.PDF.ObfuscatedNameObject' and the embedded JavaScript point towards a downloader or exploit delivery mechanism. The embedded URLs are related to XFA forms, which are often exploited in PDF-based attacks.

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
f8c55733cb51f40c9e44a4f89d1f3cd7089db7d8a12957b18a92923df89cfe45		 pdf-javascript-stream PDF /JS object 12 at offset 0xE85 3184 bytes
stream_000_off00000458.js
b9bb28b97e43cf37e0a052f4ba8558b669b9d1540b6093ecf683a0485b450dec		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x458 5747 bytes

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