Malicious PDF — malware analysis report

Static analysis result for SHA-256 7159a6c5f7e602ce…

MALICIOUS

PDF

159.8 KB Created: 2011-04-02 19:18:57 +08:00 Authoring application: Acrobat PDFMaker 8.0 for Word (via Acrobat Distiller 8.0.0 (Windows))
MD5: cd1a084cb83b29295e8ca7bd89fcefe5 SHA-1: bee7dfad133b3fc60429ce7ad202efc6405e1418 SHA-256: 7159a6c5f7e602ce2161ae4987c5f362715d3ceafe9902646e58f21704e98057
260 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and RichMedia (Flash) content. Heuristics indicate it exploits CVE-2011-0611, a known vulnerability in Adobe Flash Player, to execute a payload. The embedded JavaScript, specifically the `javascript_obj0012_000.js` file, uses a custom `myunescape` function and then calls the standard `unescape` function, suggesting obfuscation to hide the exploit details. The primary attack vector is the exploitation of the Flash vulnerability for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 10

  • Adobe Flash Player RichMedia exploit critical CVE likely CVE_2011_0611_FLASH_RICHMEDIA
    PDF combines RichMedia Flash activation with an embedded AS3 SWF loader (ByteArray/loadBytes) and shellcode heap-spray staging. This is the static exploit shape associated with CVE-2011-0611 Flash content delivered through Adobe Reader.
  • 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.
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
160260-mkt.swf
544a34cd4b5a80a7be5a895a246f96329df4b1d6a549f8c10f60440d3ba47a0c		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x7C28 2016 bytes
javascript_obj0012_000.js
ee63cef875923ae60629314faca26aac49e2cfa4aa7030f5b190c3d365dafa0e		 pdf-javascript-stream PDF /JS object 12 at offset 0x5C1 5204 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
stream_003_off00001201.bin
5d15f4baea845a5b76db1b4a7203d689313e1ebbd2e22ee67dd391be4a9e188a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1201 167610 bytes

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