Malicious PDF — malware analysis report

Static analysis result for SHA-256 50aa2b4dd9af9d3c…

MALICIOUS

PDF

4.0 KB Created: 2009-08-21 19:43:35 Authoring application: Eblasha 7.6.7.9 (via PDF Library 10.4.6.6)
MD5: 8abab6c772cc14c27eed100c0e031c9a SHA-1: 304a8a5357e238e7a654f62228d0e1c7caaf4db5 SHA-256: 50aa2b4dd9af9d3c2c3144da058ff4d0879f9c8f7bacaefff2a25623ec3762ca
326 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. The ClamAV detection (Pdf.Dropper.Agent-7212611-0) and the detection on an extracted artifact (Js.Exploit.Shellcode-18) further confirm its malicious nature. The embedded JavaScript, identified as 'numeric_charcode_stage_000.js', is likely responsible for downloading and executing a secondary payload, a common dropper behavior.

Heuristics 9

  • 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-7212611-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7212611-0
  • 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.
  • 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.
  • ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85
    ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
44a97f5993f3f3e09e3133cca94a0a42c5b7af1c8ce2c11806dda0954451098c		 pdf-javascript-stream PDF /JS object 13 at offset 0x37C 15877 bytes
numeric_charcode_stage_000.js
15fe31beb9a76c6b0e5feb58818fde493fdd7042a48653543c11b4f5e439faae		 deobfuscated-js numeric char-code string decoded JavaScript at offset 0x3C9 4758 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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