Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8490200d62786da…

MALICIOUS

PDF

8.2 KB Created: 2010-02-19 14:35:40 +03:00
MD5: c743cac435d30faa5cc033a3bf08c398 SHA-1: 7c3ff2a90d0327eb4180e2660ee746f8d9db1db9 SHA-256: b8490200d62786dae714cb7be279d6b706e1814c202010dbf829cd6732aac368
118 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that leverages the CVE-2008-2992 vulnerability, indicated by the 'util.printf' function. This vulnerability allows for the execution of arbitrary code. The presence of multiple JavaScript streams and the 'unescape()' function suggest obfuscation to hide the malicious payload. The primary attack vector is likely the exploitation of a PDF reader vulnerability to run embedded scripts.

Heuristics 6

  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj263984_000.js
03e275237693ef29a421b490b7018526f7221351de3afe32bc3e9b828a12e859		 pdf-javascript-stream PDF /JS object 263984 at offset 0x200 7010 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
javascript_obj263985_001.js
a5e4e3295a8fdddb02cd865946104ee7385081bd85c245d471f1d82de491f079		 pdf-javascript-stream PDF /JS object 263985 at offset 0x723 153 bytes
javascript_obj263986_002.js
171e622b3ab91a2384a0c8106a0f5135a44a9ac07abe5482b660bc508f144c79		 pdf-javascript-stream PDF /JS object 263986 at offset 0x7F3 512 bytes

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