Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae79e9334520f592…

MALICIOUS

PDF

2.3 KB
MD5: 0ad3282a6117ad71dd197f1c676bc57f SHA-1: b4d518a90c76c7033b52a646763b79c875c23b4f SHA-256: ae79e9334520f59225fea4d2ade1715fb5aa5b58035e3b0f03e6490fcaa2c590
118 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, which is triggered by the CVE-2008-2992 exploit. The JavaScript is obfuscated and uses unescape() calls, indicating malicious intent. The primary function of the script appears to be downloading and executing a second-stage payload. The extracted JavaScript files are the main indicators of compromise.

Heuristics 5

  • 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. (matched in decompressed stream)
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj263984_000.js
ff0ff73094de59b38c92629b9ebf35d391f42c7467e6a422bec7732b89864d7f		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 7091 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
javascript_obj263985_001.js
c3dbc4a5dc5950229113e2f6beca339d05f1d27bc3a79fdb3754374a6bfb3278		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6DF 156 bytes
javascript_obj263986_002.js
a100c31cf3c89196a2c2fc480260f9cbadc16d43297b06795d354d1750295cca		 pdf-javascript-stream PDF /JS object 263986 at offset 0x7B1 513 bytes

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