PDF malware analysis — malicious · f4e6bebc65d20c20

MALICIOUS

PDF

17.6 KB Created: 2009-08-07 08:20:10 Authoring application: nwtfyYs49EkU (via yckABl)

MD5: 697569be97d3f92d0a29f2dc9d432a0d SHA-1: 817efb84751d6cb2bb156a1edb37c895c1f71def SHA-256: f4e6bebc65d20c203ef7886b55a99c994fb6ac4ee2bdc02e903065d60dae21fe

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 critical ClamAV detection of 'Js.Trojan.Obfus-48' strongly suggests malicious JavaScript is present. The JavaScript stream is obfuscated, and the eval() call is a common technique for executing such code. The primary function of this script appears to be downloading and executing a secondary payload, as is typical for this type of obfuscated JavaScript malware.

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` `f4862f17851ba786328ce7db171b3a109668136160c923edb5632e8b1aa53596`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	16630 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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