Malicious PDF — malware analysis report

Static analysis result for SHA-256 b344e831dbc3f931…

MALICIOUS

PDF

2.3 KB
MD5: 9b93cd82a4c1ddacab256188fbd7e571 SHA-1: 4c3331b48fce889358b03c826ea82bc10ff42688 SHA-256: b344e831dbc3f9318d7e760a630de4f65c2734215c54dc248336984b9308917c
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. A critical finding is the CVE-2008-2992 exploit, triggered by a util.printf call within the JavaScript. This exploit is known to facilitate arbitrary code execution. The presence of unescape() further suggests obfuscation of malicious JavaScript intended to download and execute 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj263984_000.js
4a21a4a40f82f4c0f20327f84e133b456658a4bb096f11c9331efcea899f23ad		 pdf-javascript-stream PDF /JS object 263984 at offset 0x197 6914 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
55bf690da229d50ce2d38ec37d63d62b8cda740cd8e1af7060f301e7b5dc091c		 pdf-javascript-stream PDF /JS object 263985 at offset 0x6B3 155 bytes
javascript_obj263986_002.js
3f7d885ef63e3b9d91533cc1ab726e5fc31c2e353eb580e298081426bc7e109b		 pdf-javascript-stream PDF /JS object 263986 at offset 0x786 515 bytes

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