Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9715df23e0c8291…

MALICIOUS

PDF

1.95 MB
MD5: 08f1659c9549c182a6d3958693b74f14 SHA-1: b44e7aa26a60a07ab08da5d4823a2b8cc5658829 SHA-256: e9715df23e0c8291790e675f2a180b69594f55dafe19fc25b45ef4283eca723e
258 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages multiple critical vulnerabilities including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf). These exploits are used to execute arbitrary code, as indicated by the 'Js.Exploit.Shellcode-18' ClamAV detection on an extracted artifact. The JavaScript is obfuscated but appears to be designed to download and execute a second-stage payload. The presence of multiple critical exploit firings strongly suggests a malicious intent to compromise the user's system.

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
1d0e8367ec066c290516cb8bc3e0835c2183da0551d02104128ddf153663721f		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 1512 bytes
legacy_pdfkit_stage_000.js
d8f40c6c4e1baca5c3eaf545b16ed695eddef38c348702900e4231c1b804cf38		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0x803 4597 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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