PDF malware analysis — malicious · 3720e00f018f29b2

MALICIOUS

PDF

4.3 KB

MD5: 953974f94b8a3c69fea3782472cb04b7 SHA-1: 640229eaa9207abd0d7f66d7e9a979272f0bd748 SHA-256: 3720e00f018f29b229fe4990ba9fac4620a9456f7cd554dab5751451d295a58a

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the 'eval()' function and 'String.fromCharCode()', indicating obfuscated code execution. The critical CVE-2008-2992 heuristic firing confirms the use of 'util.printf' to decode and execute JavaScript, a common technique for exploiting PDF vulnerabilities. This suggests the primary goal is to download and execute a secondary payload.

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` `23ca8076708d0a3788fe2703af3f82bd35e7d30d0793537f877db0b2ce86c229`	pdf-javascript-stream	PDF /JS object 5 at offset 0x107	23446 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` `647b0f0370ba3a1aa25dec67e1dc8e41d91692721d7295621fdc50452e6c7c84`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x115	6883 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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