PDF malware analysis — malicious · 415e9ced8eaad038

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 40a616dc99159d2fc6f12a49482ee151 SHA-1: 5d26ba343ec6f690d276447898974491dc5b13a4 SHA-256: 415e9ced8eaad0380a16c73804e2208297b832afb7501666085f32a5220386c2

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF sample was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript with an eval() call, indicating obfuscated code execution. The JavaScript is likely responsible for downloading and executing a secondary payload, a common technique for dropper malware. The use of String.fromCharCode further suggests an attempt to obfuscate the malicious script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Pdf.Dropper.Agent-7254116-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7254116-0
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `6b50052772750003b41f6318ad44081b15c3a3b0ffbb0e5b66e0864a44c0b2a2`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	936 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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