PDF malware analysis — malicious · f0fea0a5628e91d9

MALICIOUS

PDF

17.4 KB Created: 2008-12-28 00:39:24 Authoring application: Bm4v1 (via tJN5TossdK)

MD5: 95652052606bfad06b35e06f5f68892a SHA-1: 666ebec01a7e9fa6fb9b268adf076653f752e57e SHA-256: f0fea0a5628e91d98852793930b7507bbd00af04c39f200c373afae550c07856

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 is present. The JavaScript stream is obfuscated, and the eval() call is a common technique for executing malicious code. The primary intent appears to be the execution of this obfuscated JavaScript, which is likely designed to download and execute a second-stage payload.

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` `795c51d86913d16c49bd24e1bbcf5d378f880b47ec438cd986876d3076352441`	pdf-javascript-stream	PDF /JS object 7 at offset 0x23F	16467 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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