PDF malware analysis — malicious · c9bbee5fd425717e

MALICIOUS

PDF

4.3 KB

MD5: 097c77484684c88c9ec6a5f4abb3c6b3 SHA-1: 8d4ea133e0a10a775cdb135459258409ed6a4070 SHA-256: c9bbee5fd425717ea7d52258b5b8ec73be0cea54a307faccd63886918415e369

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscation. The critical CVE-2008-2992 heuristic firing confirms the exploitation of a known PDF vulnerability to execute arbitrary code. The deobfuscated JavaScript stream, 'numeric_charcode_stage_000.js', is the primary artifact, likely responsible for downloading and executing a subsequent payload. The lack of specific indicators for a known family leads to an 'unknown family' classification.

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. (identified after JavaScript deobfuscation)
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `9481b3c88a460b316f61c824c753d4f66fee745068e1dd2b4e647417317acfd9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	22806 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `2b7e0cd1e09ae71d8317f9b907686a48613c43a34b107c4b3eba70787cb818be`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6724 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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