PDF malware analysis — malicious · a58c68f595079ff9

MALICIOUS

PDF

17.6 KB Created: 2008-12-23 11:21:17 Authoring application: mxl7uGVpAjR0 (via EWYN9WSc55xOph)

MD5: 676e853a40939d06358e2e051094a00f SHA-1: 5ef4761f2be06530fe2ae643f7ce3bc247e756e7 SHA-256: a58c68f595079ff9084b20c9a324dd9f0340446a499d866349898bc01e42c0ea

126 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is heavily obfuscated, as suggested by the PDF_FROMCHARCODE and PDF_EVAL firings, and is detected by ClamAV as Js.Trojan.Obfus-48. The primary function of the obfuscated script appears to be downloading and executing a second-stage payload, a common technique for malware delivery.

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` `28916898947be19de8e87101d7d3964a631968c45e3264ead95357f309e887a8`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23B	16643 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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