PDF malware analysis — malicious · 522dda8cc3fc5c7b

MALICIOUS

PDF

1.6 KB

MD5: e1587103ce926d62285e4126506261b7 SHA-1: dddb47a15a845800b471cc7aa0eea3bd2ab3de8b SHA-256: 522dda8cc3fc5c7b3992d4547b91cf8a84b9a8f2a9801cf919a362f6fc2e29df

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript with obfuscated code, including calls to eval() and String.fromCharCode(), which are commonly used to download and execute further payloads. The presence of a JavaScript action and an embedded JS stream strongly suggests the script is responsible for the malicious behavior. No specific malware family could be confidently identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9962

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` `0d1ac88612d257ae69cd3bc52dac763b6c3b4ce3390313fd5f552418bf4ed2cc`	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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