PDF malware analysis — malicious · e975ecf5e15608f2

MALICIOUS

PDF

4.4 KB Created: 2008-12-17 23:30:58 UTC

MD5: e2f0b76d32d80205ffbad58940b57ea3 SHA-1: c7987a3dc55c5257edfa262b7a86d1b360241c90 SHA-256: e975ecf5e15608f2ea4bb8a0987add2f44d65354a2f6e4ae1e097ab12858f0f8

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream itself is heavily obfuscated and utilizes eval() and String.fromCharCode(), indicating an attempt to hide malicious code. The ML classifier strongly suggests maliciousness. The primary function of the embedded JavaScript appears to be downloading and executing a second-stage payload, as indicated by the obfuscated nature and the presence of a large JavaScript file.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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_obj0006_000.js` `1d219b1ca09c3485dd6ca5ad8bc763b894c06c7544fa6493599dc9f9e7fa00de`	pdf-javascript-stream	PDF /JS object 6 at offset 0xB5	30882 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 4 long base64-like blob(s).

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