Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f7cd60b141fccf…

MALICIOUS

PDF

7.2 KB
MD5: e62f46f645d2f49a2d81ac46fa37acdc SHA-1: a3731818c0f0dfa6fdc408e843d26b53ee4a1c50 SHA-256: 97f7cd60b141fccfffcf1b2d4c5c120e0db3a05dc55fc75ba6d261f76c8acdcf
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell 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. This vulnerability allows for the execution of arbitrary JavaScript, likely to download and execute a second-stage payload. No specific malware family was identified, but the technique is common for initial compromise.

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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • 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/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000327.bin
c58f059639990219d29bcca0235e098d8d7c5eb51aea043e410beec973c10630		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 4168 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
stream_003_off0000087d.js
bb45ac4eef0b4865e586bcb3df8601f05f1f5207d18c7d8a8fa0c58f9749af8a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x87D 641 bytes

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