Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caca3ddd237c60b…

MALICIOUS

PDF

228.6 KB
MD5: e45ee7f906acee0b5c7b626b51012e49 SHA-1: b8d3bf032fd78be2daa45603340ee5560b8a1648 SHA-256: 7caca3ddd237c60bdcb2585a962764f35c938d62eb401b3ef93b6ed337761c29
258 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains multiple critical heuristic firings indicating exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992 through embedded JavaScript. An extracted artifact, legacy_pdfkit_stage_000.js, was flagged by ClamAV as Js.Exploit.Shellcode-18. This suggests the embedded JavaScript is designed to download and execute a second-stage payload. The obfuscated JavaScript and multiple exploit firings indicate 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
f4fb4b7156d0f634a58c40e3f6fc7125b6a23be69218b213876a6780d7421db1		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 3399 bytes
legacy_pdfkit_stage_000.js
c9510263c800c44177031387fbf8e46fd5854b4bb7008e5ba973ce3d01dd5dd1		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xF62 10946 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: likely
Carved artifact contains 11 eval/decoder/string-building token(s).

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