PDF malware analysis — malicious · f67434f04998473b

MALICIOUS

PDF

3.9 KB

MD5: 541b42353cea519c51e2d2b622d8a92c SHA-1: bed8e6d3965855ee92afd6efeaab008296937dc5 SHA-256: f67434f04998473bb0d0fdd41650d698cc0a95d3527bf8a4f119a3e149121d4a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is obfuscated and uses eval() to execute code. The presence of two embedded JavaScript files, 'javascript_obj111711_000.js' and 'javascript_obj111712_001.js', further supports this. The script's likely intent is to download and execute a second-stage payload, a common technique for initial access. The document body contained no readable content, making the analysis reliant on script behavior.

Heuristics 5

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. (matched inside decoded stream)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `ffef9d59e51fb699281965336bd001c6c1223125655979b8d07cc6ce50633cc9`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	372 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `dc124409babe5322e2a1dd5ef03a2b3430cdd4798f54d5a31407daf61149c9bb`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x248	5244 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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