PDF malware analysis — malicious · 4cd589545be61970

MALICIOUS

PDF

17.5 KB Created: 2009-07-13 20:48:32 Authoring application: Kgi1oYLT (via mchMG1h)

MD5: 50128b6492f87637e48a3171248244e6 SHA-1: 5899a6b2de43218a3b43366a395fcc9b16aca288 SHA-256: 4cd589545be619704cf2b72a048f748a6382a7343406cb4f8bc6af455cc56d6f

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ClamAV detection 'Js.Trojan.Obfus-48' strongly suggests malicious JavaScript. The JavaScript stream is obfuscated and uses `eval()`, making its exact function difficult to determine statically, but it is highly probable that it attempts to download and execute a secondary payload. The document body is largely unreadable binary data, providing no contextual clues.

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` `77d25087f03a3cae885f95b6b92a0a1b3f805e9f27b84920bfed6bec5f7a8a87`	pdf-javascript-stream	PDF /JS object 7 at offset 0x239	16560 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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