PDF malware analysis — malicious · 4204227a502c6644

MALICIOUS

PDF

2.8 KB

MD5: 82f3b7316b7a7f59f12ba45f246c18c0 SHA-1: 7a211758e9845511136e4bdda90233903872efd9 SHA-256: 4204227a502c6644c3adad33f55e02ff2a3d8e658046d521f200aa040c2f9525

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript streams, one of which utilizes eval() and String.fromCharCode() for obfuscation. This suggests the script is designed to download and execute a second-stage payload. The presence of multiple JavaScript objects and the obfuscation techniques indicate a malicious intent, likely to compromise the user's system. The exact payload and delivery mechanism are not fully discernible due to the obfuscation.

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` `b0aab7252121e0222d9ea23614718eae273293b06bcb6cd2b4e3acfc59828b7f`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	257 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `983ae82621f2323455aa1ea877e1b4dec905003c861d82d55fe8bcdb4252e151`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x267	3295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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