Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ad5ce58f93d417…

MALICIOUS

PDF

667.6 KB
MD5: 64d56bd92dde1412ce33afc8e2a3b7a8 SHA-1: a0ec632411b495fef797946eed7e731699a27e29 SHA-256: c9ad5ce58f93d4176e86ccdda912ff6ca39da6721113a7d9feedd3904b498820
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple known vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) through functions like Collab.getIcon, Collab.collectEmailInfo, and util.printf. The extracted artifact 'legacy_pdfkit_stage_000.js' was detected by ClamAV as 'Js.Exploit.Shellcode-18', indicating it likely contains shellcode for further exploitation. The obfuscated JavaScript and the nature of the exploits suggest the primary goal is to download and execute a secondary malicious payload.

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
d730f639b14544c0f1864e2b96f5f9937ce18103b4afd52e5cf711af1ac0616e		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2837 bytes
legacy_pdfkit_stage_000.js
5c2bebe7b3ddb7d0631f7b1741e5e4c0e99b38f8bf527004345ce56378d2ff67		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xD30 8394 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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