Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f1310dd5cd9ab1d…

MALICIOUS

PDF

45.4 KB
MD5: fe233b580fc86a7413f813d1af83dc98 SHA-1: 550b249090d6bc80958072cce00b9f1af2a98700 SHA-256: 6f1310dd5cd9ab1dd413227b3e678d193b8ea6eb0d89ef9a19577afbe29021a6
170 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF file contains obfuscated JavaScript that exploits CVE-2009-0927 using the `Collab.getIcon` method. This script is designed to download and execute a second-stage payload from the URL http://ensenm.ru/u2eYZhGBnR3t9XXFSOUZ8u9nXg3XE8T1?p=1&s=oldpdf. The use of JavaScript and exploitation of a known vulnerability points to a malicious document designed for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (identified after JavaScript deobfuscation)
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX
    Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
  • 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://ensenm.ru/u2eYZhGBnR3t9XXFSOUZ8u9nXg3XE8T1?p=1&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
c01c3e53e39ac36ded4446d33fd6f3f7ffdef810eedc626f3885541d494db072		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9143 bytes
custom_b64_stage_000.js
124b2d1872d3dd58670f646a54754f1972d530abb71fc4ca715580454ba1a74a		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1499 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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