Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac05de66deb1544…

MALICIOUS

PDF

297.7 KB
MD5: ea9898b62452b6758864ad35e630a80c SHA-1: 6b5dccf7017476c4c46b7405230f0d5a5c24c58c SHA-256: 1ac05de66deb15440d39fcc7b23a3fa69cfe6353ce7d07a3a6487fab58aa5914
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) related to PDF object manipulation and JavaScript execution. The heuristic firings indicate that the PDF launcher concatenates information fields, extracts characters at a fixed stride, and evaluates the result. An extracted artifact was detected by ClamAV as Js.Exploit.Shellcode-18, suggesting the JavaScript is designed to download and execute a malicious payload. The deobfuscated JavaScript indicates attempts to construct URLs and execute code, consistent with a downloader or initial access stage.

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)
  • 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 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.
  • 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_obj0008_000.js
c5d4ace706942ec1853e93620c7eafc6d3ddd88a3516f4846c4ac163dd34a292		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2462 bytes
legacy_pdfkit_stage_000.js
e637e70d32df388a9f3335487a5a1389da1c12215be19c1f3892440d7b458a01		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xBB9 8376 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s).

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