PDF malware analysis — malicious · 38aeb9552dc6d024

MALICIOUS

PDF

17.8 KB Created: 2010-03-12 03:50:15 Authoring application: MR8AR83pl (via CeJgpvHer)

MD5: e1d0cd1bf12983fba170a458d90d03b9 SHA-1: 91e6e771c8946b3828390c13f638575ba79dc9c3 SHA-256: 38aeb9552dc6d024ebebd3cb64b00ebee1fc2c348c9642df7d3d054ccce1ab2f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript is heavily obfuscated using String.fromCharCode and eval(), indicating an attempt to hide malicious functionality. ClamAV detected this as Js.Trojan.Obfus-48. The primary intent appears to be the execution of this obfuscated script, likely to download and run a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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.
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` `c8746259a996dc9dce688aebceb1a019401ae11a5cf23dfd82a9b60b0e2b01c0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	16931 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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