PDF malware analysis — malicious · dade720fe305f356

MALICIOUS

PDF

4.5 KB

MD5: e8fd33fa255e07e1df7a9a397400efcb SHA-1: 184838dd29380ba3eb681ebfe00e3d3124361139 SHA-256: dade720fe305f356759812c0f85390d53a4e22c83a911a2e392bfb3be6025641

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

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 this vulnerability via util.printf. The extracted JavaScript streams, particularly 'numeric_charcode_stage_000.js', are likely responsible for downloading and executing a secondary payload. The lack of specific IOCs like URLs or hashes prevents further attribution to a known family.

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` `54584534a5ef545366e89e8f29de831bcef48acd9ae27caea53a5e416807a1e4`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	24497 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` `8e440861797b03bcc880a0c20c55ae2bf7816d64781bb6e07e2450a3e87b3a50`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	7222 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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