Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da2fac5bef224cd…

MALICIOUS

PDF

171.4 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: b45b86c3c7789cd9cc0a3b7cac3e1425 SHA-1: e1ca2f7a0798891ff629be84116e8f578a92b616 SHA-256: 0da2fac5bef224cd0e04a91c51c59dd660f2b8b1041ecf36daf87a3637b99cb4
330 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains JavaScript that utilizes the unescape function, a known technique for obfuscation and exploitation. Critical heuristics indicate a CVE-2009-0658 exploit targeting Adobe Reader's JBIG2Decode filter, which is used to perform a JavaScript heap spray. This script is designed to download and execute a secondary payload, as evidenced by the 'Pdf.Dropper.Agent-7228407-0' ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 10

  • 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.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • ClamAV: Pdf.Dropper.Agent-7228407-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7228407-0
  • 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
f25cb843e519970d0deda333237884361d21521aedd223a6382a8d85f621ad87		 pdf-jbig2-stream PDF JBIG2 stream at offset 0x65A 3739 bytes

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