Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc8071242b41510…

MALICIOUS

PDF

1.5 KB
MD5: d289f6ba8cd9f9697acd4d3c8733c1ba SHA-1: 3ca122db4169452c43892a06387c25ecb1b92fe1 SHA-256: 1dc8071242b41510a881518963e6a7671546cc78321f6efd16e713e1eb6dd29d
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE_2008_2992 heuristic firing suggests exploitation of a vulnerability related to `util.printf`. The JavaScript stream was further processed using `unescape()`, a common obfuscation technique. The overall behavior points to a malicious PDF designed to exploit a known vulnerability and likely download a second-stage payload.

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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj111111_000.js
b1d6becd55a5afa888cf095b67e24bb3991d99be0ab127a70d1119a9ad1737e3		 pdf-javascript-stream PDF /JS object 111111 at offset 0x160 2453 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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