Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc97013830ebe6aa…

MALICIOUS

PDF

33.1 KB Created: 2009-05-14 12:40:13 +08:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 7.0 (Windows))
MD5: 6e4c33486ca0f8eae8a9205364f2763f SHA-1: a6f303cb553fbc01fb682e6245fbeaed5beb06e7 SHA-256: cc97013830ebe6aad2dbee0065a9ecae7a6c071fdfe367da41cc6786b5f71598
134 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript stream, identified as 'javascript_obj0025_000.js', likely contains obfuscated code designed to exploit a vulnerability within the PDF reader. The presence of JBIG2 decoding with active content further suggests an attempt to conceal malicious elements. The primary attack vector appears to be the execution of this script upon opening the PDF.

Heuristics 9

  • JBIG2 + active content high CVE related PDF_JBIG2_ACTIVE_CONTENT
    JBIG2Decode appears with JavaScript/XFA/RichMedia — a related indicator for JBIG2 parser-exploit families including CVE-2021-30860 and CVE-2009-0658, but not a unique CVE fingerprint.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • JBIG2Decode filter medium PDF_JBIG2
    JBIG2 image decoder present — historically used in zero-click exploits
  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT
    Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
  • 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.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0025_000.js
70363eab523d8f51eefbccd782cec609f06d066cd25fd68d9fbfb9bb201d04fb		 pdf-javascript-stream PDF /JS object 25 at offset 0x239A 3313 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
jbig2_00_off00002c9b.bin
f5b6a0f27ca4307ca627a8c5586b726b5225793295bf99f6ce205789117b8f12		 pdf-jbig2-stream PDF JBIG2 stream at offset 0x2C9B 3986 bytes
font_00_sfnt_off00003d8b.bin
054efc047363b9aa71725e85e1e2afadc15e8323b274edb5732ed315505f4d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3D8B 179816 bytes

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