PDF malware analysis — malicious · 382cfc9648f0cbac

MALICIOUS

PDF

1.6 KB

MD5: e9fb7742d2d4c268b051071fbed26a3b SHA-1: 8b0f019b27b01e846214ef63576510f36bb0d59d SHA-256: 382cfc9648f0cbac5af4d333e4c731d6094310fdf0a2c19dfa273137edfbc6c4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics, including a high-severity PDF_EVAL rule indicating the use of eval() and a critical ClamAV detection for obfuscated objects. An embedded JavaScript file was extracted, which likely contains obfuscated code. The presence of PDF_JAVASCRIPT and PDF_JS rules further supports the use of JavaScript within the PDF. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern involves leveraging JavaScript to execute arbitrary code, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0009_000.js` `126ff96c1dd6d1f15d3089bc49e25f53c359f19530c83d7ccadf4c5783c16840`	pdf-javascript-stream	PDF /JS object 9 at offset 0xDC	3898 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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