Malicious PDF — malware analysis report

Static analysis result for SHA-256 437f3a88d7b71b6d…

MALICIOUS

PDF

2.3 KB
MD5: 3251e4826d19e8fe5ab1553330063c46 SHA-1: 7591efbe1f4f2dd184eb23360c581c219dac7856 SHA-256: 437f3a88d7b71b6d217805969a94e5ffe58eae9b8b65ee19c33f710e7f957289
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the `unescape()` function and a `util.printf` call, indicating exploitation of CVE-2008-2992. The JavaScript is likely designed to download and execute a second-stage payload. The presence of multiple JavaScript streams and the specific exploit signature strongly suggest malicious intent.

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
cfc3b4abcd1ed52780a900f676c065b34f6921d0c95230abfa4d36a62b586727		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 7056 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
d4f8883ee3805b32c21214a3b3f0b2ced521fd1414686a97fa066f2723ccfb40		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6DE 153 bytes
javascript_obj263986_002.js
526c47820387b44957446427fc57191db85ff7ff1e8751aaef07dfa0f5602655		 pdf-javascript-stream PDF /JS object 263986 at offset 0x7AD 517 bytes

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