Malicious PDF — malware analysis report

Static analysis result for SHA-256 63611666ab4ee912…

MALICIOUS

PDF

305.5 KB Created: 2009-03-20 00:55:26 -06:00
MD5: 7308e1316ffed95dc7d8a5a801c4cfa1 SHA-1: 5acf6717381eae52902843584df3c6e2e31a189e SHA-256: 63611666ab4ee91225c90d6c018e5ec2934bd3136d6bae7456cbcfbd8a29bbe1
270 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that exploits CVE-2009-0658, a known vulnerability in Adobe Reader's JBIG2Decode filter. The JavaScript is designed to download and execute a second-stage payload, indicated by the obfuscated 'unescape' calls and shellcode-like data. The primary attack vector is exploitation for client execution via JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8417

Heuristics 9

  • Adobe Reader JBIG2Decode generic heap-spray exploit critical CVE likely CVE_2009_0658_GENERIC_SPRAY
    PDF combines JBIG2Decode image streams with JavaScript heap-spray or decoder scaffolding. This is likely CVE-2009-0658-family Adobe Reader JBIG2 exploitation, but it lacks the stricter Reader-9 version gate or decoded page-word shellcode fingerprint required by the exact rule.
  • 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.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/g/img/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0016_000.js
88d4b96f222e24ff9eec74a5d4d9d79375e547f1f33e98b9aadddecb7bfa32ea		 pdf-javascript-stream PDF /JS object 16 at offset 0x90A 1841 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
javascript_obj0033_001.js
f09d31d07391c14c5b16d812fac39f4f3d3d4f41b4894fbb7f98f7e80afdd11f		 pdf-javascript-stream PDF /JS object 33 at offset 0x104F 1757 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
icc_00_off00014713.icc
07c1e0738ba6068b961ab698e24d5d9c06f71d4ee1d863aed239a24dd1fb8896		 pdf-icc-profile PDF ICC profile at offset 0x14713 560 bytes

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