PDF malware analysis — malicious · f728b17908fb45ed

MALICIOUS

PDF

70.1 KB

MD5: c5fa2064c611e4ce99cebc117d714e1b SHA-1: ef8a871d7e273240e058c19f3ea06f9070389458 SHA-256: f728b17908fb45ed8beccf3d2029756c2b3a47a3839896eecf0d9ddec6fea4af

66 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 `eval()` call and `String.fromCharCode` usage suggest obfuscation, and an extracted JavaScript file was flagged as suspicious. The script's purpose is likely to download and execute a second-stage payload, but the exact URL or execution method could not be fully reconstructed due to obfuscation. The document body content appears to be malformed or encoded data, providing no contextual clues.

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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_obj0006_000.js` `cb35269344071f0ebb490ce242e7fc967e1eb69b6e776bd3ea3b4beceb5496eb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x12D	71227 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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