Malicious PDF — malware analysis report

Static analysis result for SHA-256 9101784444708797…

MALICIOUS

PDF

75.1 KB Created: 2009-11-13 19:48:20 Authoring application: PDF Library 2.7.7 (via PDF Library 4.9.10)
MD5: 330c3e7e2bbd5a368975113e9f982023 SHA-1: 008452447522f0c79d51c2a33ec66ff5146740a1 SHA-256: 9101784444708797523bb15c7d2918f315757662b60bc0c93341dc5bf5a8eef6
338 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploits for CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, all related to Adobe Reader JavaScript vulnerabilities. These exploits target specific JavaScript API sinks like Collab.getIcon, Collab.collectEmailInfo, and util.printf. The file also contains embedded JavaScript streams, one of which was deobfuscated into 'legacy_pdfkit_stage_000.js'. This suggests the PDF is designed to leverage these vulnerabilities to execute malicious JavaScript, likely for downloading and executing a secondary payload, as indicated by the ClamAV detection on an extracted artifact.

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.Exploit.Agent-36110 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-36110
  • 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.
  • 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
ca85ea0b15dc634937d3676b424a4d9c49bb3ca458faee694303b46c76aab6ad		 pdf-javascript-stream PDF /JS object 7 at offset 0x1A5 37917 bytes
legacy_pdfkit_stage_000.js
b982cf4ed88723d6814a21cc0b5836f9915018489949dbaf5494e6598b43a5ad		 deobfuscated-js numeric array subtract-key decoded JavaScript at offset 0x1A5 10024 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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