PDF malware analysis — malicious · 786241f18543ec0e

MALICIOUS

PDF

40.0 KB Created: 2010-07-25 10:32:51 Authoring application: FPDF 1.6

MD5: e5a83e42385ee117ee4397db3a0baf97 SHA-1: 29bb9841d907c0a604e5d2933c67290bbaae1883 SHA-256: 786241f18543ec0ec758f7d09bab2e98fc17ddaa46f04d6e7bca82ed16d93e37

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged it as malicious with high confidence. The embedded JavaScript stream, named javascript_obj0007_000.js, is highly obfuscated and uses eval() calls, suggesting it's designed to download and execute a second-stage payload. The PDF's metadata indicates it was authored by FPDF 1.6, a common tool for generating PDFs, sometimes used for malicious purposes.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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.
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` `310ad363c2e36c288dd15f41169b954acbde717816b3f876363903df9030d327`	pdf-javascript-stream	PDF /JS object 7 at offset 0x1EB	40124 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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