PDF malware analysis — malicious · 450532f7b07dd8da

MALICIOUS

PDF

4.0 KB

MD5: 03437ae3dc0aa4c34d426000e6c2d666 SHA-1: b78ac6dea862bc10329476f155e960ab4f737625 SHA-256: 450532f7b07dd8da8ed6bc55db9c0153d46f5221710d0ed347218ce39cdf1ac4

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests that the JavaScript is obfuscated and likely uses eval() to execute arbitrary code. The extracted JavaScript files, 'javascript_obj111611_000.js' and 'javascript_obj111612_001.js', are the primary artifacts. The script's intent is to download and execute a second-stage payload, which is a common technique for initial access and further system compromise.

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_obj111611_000.js` `f878f8f484bc5ad5571f34002f16968233aed038773910453c979b6d457b12c3`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `9b574c731cd1a272f1e750fa3d6f2dd4135b38351b63fb35cbed4ad5e2d74d53`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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