PDF malware analysis — malicious · a611b719966469e3

MALICIOUS

PDF

17.3 KB Created: 2009-08-23 16:23:48 Authoring application: d5SI9pwsBvExyC (via r6v98rO)

MD5: fe57bf23561e3c31401b817d95949b88 SHA-1: 85918bff9b64ea4b85e302bce09549ec3943deed SHA-256: a611b719966469e3f0e829eb6b0766b0ce4ff3ee85411531dee3a6a472b19155

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_FROMCHARCODE, and a critical PDF_EVAL call. ClamAV detected this as Js.Trojan.Obfus-48. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, which is a common technique for delivering 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` `97eee6ef5663c59c8f80bcb77ca0cd761dd89a169eda1ea1ba1d9aea8e2f94ca`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23D	16376 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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