PDF malware analysis — malicious · b318778577d070f3

MALICIOUS

PDF

12.0 KB

MD5: beec395c19e283e6972853bdfb17d906 SHA-1: e455d39fd799301e0d4cfe36c8b759739aaa0e30 SHA-256: b318778577d070f375a8be0d843117d6cf356b1230414a3ea1bd7200eb9d728d

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file exhibits multiple indicators of maliciousness, including obfuscated JavaScript streams and a high ML classifier score. The embedded JavaScript, identified as 'javascript_obj0007_000.js', is heavily obfuscated using String.fromCharCode and ASCIIHexDecode filters, typical of malware attempting to hide its execution flow. This script is likely responsible for downloading and executing a second-stage payload, contributing to the overall malicious nature of the document.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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` `2a2648cd616da16f06ba13edc805d65da4266b564150bdd2b43cf2a628b5d991`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19E	12822 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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