PDF malware analysis — malicious · 9f24c38fa9911eb9

MALICIOUS

PDF

4.0 KB

MD5: bdc4c5440a21270636f4422ea1e690b8 SHA-1: 09d80f6c1f9b409667e21565ff05729d10686c69 SHA-256: 9f24c38fa9911eb90d2e47d572adc9bf82ef7fb72644a7963a66c1cd72a99db2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream exhibits obfuscation and utilizes eval() and String.fromCharCode() functions, suggesting it's designed to execute arbitrary code. The primary intent appears to be downloading and executing a secondary payload, a common technique for initial access. Due to the obfuscation, the exact payload and delivery mechanism cannot be definitively determined, hence the 'unknown family' classification.

Heuristics 5

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_obj111611_000.js` `4820a472e0011713c2c059f6aec6e7d65743b2228350c991359ee7202c683642`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `0b4c71e67c3c6ec849cf59ca1713b18cefa5fef3d847f084dc6f0a43bda282af`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5609 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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