Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1ab0da16e1b81f…

MALICIOUS

PDF

69.6 KB
MD5: 0bd25358b5b8a700fb762fba5eb76dc2 SHA-1: 421cfb89685490567d63173a665afdf6f1b4da6d SHA-256: 7f1ab0da16e1b81fadb070fb5168f0be41a824409222f2c5587e2be5564020ad
258 Risk Score

Malware Insights

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

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992. These vulnerabilities are leveraged through embedded and obfuscated JavaScript. The ClamAV detection of 'Js.Exploit.Shellcode-18' and the presence of a deobfuscated JavaScript file named 'legacy_pdfkit_stage_000.js' strongly suggest that the script's primary purpose is to download and execute a second-stage payload. The obfuscated JavaScript in the DOC BODY further supports this, indicating a multi-stage attack.

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
14462c776591fb3b0bcbbc2d321aa0099de4807bb7e0ee443af9bec036c24650		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2089 bytes
legacy_pdfkit_stage_000.js
045518b5d2528577a99478a4ee42221cb398fddde352f769a61e51f91dc8c1d3		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xA44 4560 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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