PDF malware analysis — malicious · e5c275d9186f7970

MALICIOUS

PDF

12.3 KB

MD5: 102432173c682ff00bcf3a17b7accedf SHA-1: d654eb7d00428e6088716bff83d272b120e9a989 SHA-256: e5c275d9186f7970ebe36ea865b067e9a8cfc6bfb4792f7d6efd2f54aae5d5e4

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. Specifically, it contains obfuscated JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS firings, and uses techniques like String.fromCharCode and ASCIIHexDecode, suggesting an attempt to hide malicious code. The embedded JavaScript file, 'javascript_obj0007_000.js', is likely responsible for downloading and executing a secondary payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 6

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `f75da5592ed4456b2a1d25fbb9b3c0f2d1475d1a37c8641cf1711c2b8c3c6175`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	13038 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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