Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685adb06698e67c…

MALICIOUS

PDF

21.7 KB Created: 2009-05-01 21:21:45 Authoring application: tvEeSFCPx (via NeTSnrx)
MD5: 11eec58fcb47a35b86cdbfd3a6ed43d7 SHA-1: a61423c57d5b8d4c8ba2a5cfabe50796e97670ac SHA-256: f685adb06698e67ca042b0b2ca9d621c030ea904137c90f71de936e8b1a74e4c
398 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File

This PDF file is identified as malicious by ClamAV (Pdf.Dropper.Agent-7324816-0) and contains embedded JavaScript. Critical heuristics indicate exploitation of CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf) via JavaScript. The JavaScript streams, particularly 'numeric_charcode_stage_000.js', are heavily obfuscated but appear to be designed to download and execute a second-stage payload, as suggested by the 'Js.Exploit.Shellcode-18' detection on an extracted artifact. The OpenAction trigger further ensures the malicious script executes upon opening the PDF.

Heuristics 10

  • 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)
  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (identified after JavaScript deobfuscation)
  • ClamAV: Pdf.Dropper.Agent-7324816-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7324816-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • 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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
2901692a6092564a89ce4d4d3fd2c0e52f3a82701bda4047cc1c0354703d04a3		 pdf-javascript-stream PDF /JS object 7 at offset 0x235 20931 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
javascript_obj0007_001.js
9de06af877b9e84f8dc559eb40fa40af449fae0d51da3d3aa6ab45c7c12919b2		 pdf-javascript-stream PDF /JS object 7 at offset 0x235 20571 bytes
numeric_charcode_stage_000.js
6db81a2bb5b7793125b3141a11412addcc6e270650d84673d558fa649ad58193		 deobfuscated-js numeric char-code string decoded JavaScript at offset 0x23C 4816 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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