Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc630d5230d07a9…

MALICIOUS

PDF

45.3 KB
MD5: 9ceacdbff81b3ee0d6b47e4a72044d30 SHA-1: 2365a4fb1c44ba1c0c0c5bf99e35418fbf352704 SHA-256: 0dc630d5230d07a98b9b2c7b7f7d59c78c880acd17a2a45bd3fbfe961f6d6462
170 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript that exploits CVE-2009-0927 using the Collab.getIcon method. This script decodes a further layer of JavaScript which then downloads and executes a payload from the URL http://shitd.ru/K7nElSy2hGcorkV8aMhT2FbmHCmvruA?p=1&s=oldpdf. The ML classifier strongly indicates maliciousness.

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://shitd.ru/K7nElTi2hGcorkV8aMhT2FbmHCmvruA?p=1&s=oldpdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0008_000.js
22978533ea4271092a280252b958e12bc0c46c287c0804922e4f0f015f5f24ef		 pdf-javascript-stream PDF /JS object 8 at offset 0x1D3 9115 bytes
custom_b64_stage_000.js
b0aca3e9bc1423e5587bb5851e24926635fa8bd14c34da7f14731a4240e92aab		 deobfuscated-js custom Base64 decoded JavaScript layer 2 (PDF /JS object 8) at offset 0x8A7 1493 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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