Malicious PDF — malware analysis report

Static analysis result for SHA-256 33062c9dddd33922…

MALICIOUS

PDF

69.7 KB
MD5: 1bea127da9075cb430582b6636f7f0d6 SHA-1: e2731ddf5fe844ddc57e9d63e1124b3fb1e1d03f SHA-256: 33062c9dddd339225f0ae3d7f36f5b3a51a5ad293dc866b0f065a25364ef3771
258 Risk Score

Malware Insights

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

The sample is a PDF file that contains obfuscated JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and embedded JS streams. Critical heuristics identify exploitation of CVE-2009-0927, CVE-2007-5659, and CVE-2008-2992, which are known vulnerabilities in Adobe Reader related to JavaScript execution. An extracted artifact was also flagged by ClamAV as Js.Exploit.Shellcode-18. The obfuscated JavaScript is designed to be executed by the PDF reader, likely to download and execute a second-stage 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
6529e2505f0c5914ec4972a921f530707c1bac320a1af262957b0db0071db6f6		 pdf-javascript-stream PDF /JS object 8 at offset 0x1E7 2105 bytes
legacy_pdfkit_stage_000.js
045518b5d2528577a99478a4ee42221cb398fddde352f769a61e51f91dc8c1d3		 deobfuscated-js repeated-marker hex decoded JavaScript at offset 0xA54 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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