PDF malware analysis — malicious · 4f5d2a1a9d25729c

MALICIOUS

PDF

5.1 KB

MD5: edf3005a65a587812ace62db2643e2b4 SHA-1: 1228c15bccfe89e97fec6fd663c05bbecc2fd229 SHA-256: 4f5d2a1a9d25729cd96486273a88cea892898d42da2d243b42866dd8a08b8b15

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly indicates maliciousness. The embedded JavaScript file, 'javascript_obj947103_000.js', is highly suspicious and likely responsible for downloading and executing a second-stage payload. The presence of eval() and String.fromCharCode() suggests obfuscation techniques are being used to hide the script's true functionality.

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_obj947103_000.js` `2a2113b1d0aae2c4ed2eaf9126b99cbe70c113485211bb4b75d3d5599dd3eb31`	pdf-javascript-stream	PDF /JS object 947103 at offset 0x13A	8358 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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