PDF malware analysis — malicious · 49a4703260b6e97f

MALICIOUS

PDF

5.2 KB

MD5: b1d5643b83b50dbd6a7ef250c7703814 SHA-1: f67102f03aa2149ef2b926658ea70d4abe16ba91 SHA-256: 49a4703260b6e97f4c1d12aebb8cac2aff9113074b4a9dfdc0262c3dfc46ef9f

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0013_001.js', contains obfuscated code with eval() and String.fromCharCode calls, typical of downloaders attempting to evade static analysis. The primary function appears to be the execution of obfuscated JavaScript, likely to download and run a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `bde9dc6e82d0730a025ae60dbbe717bb03e695d0b47ab9d2500a876f8eae510e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	9030 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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