PDF malware analysis — malicious · 28009f15c165603b

MALICIOUS

PDF

5.1 KB

MD5: f20ecea5b86d470c74d7ed12405fce23 SHA-1: 3ca7bba43e158bf713966260d37b32cd990561a2 SHA-256: 28009f15c165603bf0bd39f05cc1954cbaf0ac76410d111362f78e398917e9cc

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute its payload. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript file, 'javascript_obj9860_000.js', is the primary artifact, likely responsible for downloading and executing a second-stage payload.

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. (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj9860_000.js` `d36ca7f5756a0df214eaac1c8af2ac328359ce09209b20262c16031734bc827d`	pdf-javascript-stream	PDF /JS object 9860 at offset 0x134	8355 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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