PDF malware analysis — malicious · 4383b3b2e1536bcd

MALICIOUS

PDF

4.3 KB

MD5: 36dbc8b4b08044fd3d627fbdc2d30af5 SHA-1: 1cac6a37b5f9770e317299707675972563a9c3fc SHA-256: 4383b3b2e1536bcd82c94d318bd1dfb8dece8f07c2826ec5a2f300fa3c6799fc

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The critical CVE_2008_2992 firing suggests exploitation of a known PDF vulnerability. The embedded JavaScript, particularly the deobfuscated 'numeric_charcode_stage_000.js', likely serves to download and execute a secondary payload, which is a common technique for initial access.

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` `e7bbe29589e29689986a639821d04342f40fa92a78d9a108e27e5435c0103e05`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	21129 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` `f91bde724428d69823a918a2959ceb964c50936ef96ada618cf71c8f43bca630`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6205 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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