Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f290738a495678…

MALICIOUS

PDF

93.8 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: 79a67b4e4350d904d03f8fc99c587cdd SHA-1: fb6f298f770e5b9ce66b11a9e25cd8bdb7bea51a SHA-256: 35f290738a495678138fb2f1099945f2d2b754cc4d51eba00b05a3f2633fc1a3
178 Risk Score

Malware Insights

MITRE ATT&CK
T1204.001 Malicious Link/Object: User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript and triggers a critical heuristic for CVE-2009-0658, an Adobe Reader JBIG2Decode heap-spray exploit. This indicates the file is designed to leverage this specific vulnerability to execute malicious code. The presence of JavaScript and the exploit suggests a downloader or dropper functionality, aiming to compromise the user's system.

Heuristics 8

  • Adobe Reader JBIG2Decode heap-spray exploit critical CVE likely CVE_2009_0658
    PDF combines JBIG2Decode image streams with a Reader 9 JavaScript heap-spray stage. This is the in-the-wild Adobe Reader/Acrobat JBIG2Decode exploit shape associated with CVE-2009-0658.
  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0021_000.js
c108b22775026c92a327460eadf0bbd611e7bcedb0dd8e6af00e3568acd404bf		 pdf-javascript-stream PDF /JS object 21 at offset 0x37E 540 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
jbig2_00_off0000065a.bin
06597329b96ca4a1ef29b9efb508e1fa970daf42e52c33f06973c365e97b458a		 pdf-jbig2-stream PDF JBIG2 stream at offset 0x65A 3739 bytes

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