PDF malware analysis — malicious · 909910c55881edc6

MALICIOUS

PDF

17.6 KB Created: 2009-01-20 09:13:42 Authoring application: zjW4z9siXYy80x (via OlkSmrYBui)

MD5: b2b9b407df27b871a769a07490db9b79 SHA-1: fefab0ebef3b038c78060267ea7250cd04653d33 SHA-256: 909910c55881edc62650d7631c3db137c1473a8ce79d056c73f730403fe71afd

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier and ClamAV detection (Js.Trojan.Obfus-48) strongly suggest malicious intent. The JavaScript is likely obfuscated and designed to download and execute a secondary payload, a common technique for initial access and further system compromise.

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` `0323db29a7fa3f89d3bddacb4c0e1854fe1e18f96d06a2aec37f423d62f3c2ff`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	16621 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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