PDF malware analysis — malicious · e8b20a29fb632170

MALICIOUS

PDF

26.1 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: ba4887c6f40bff9a4b995c3459b4c2c7 SHA-1: 50ea2cc4c20ccf5ee94b4464b9edff277efb05b9 SHA-256: e8b20a29fb63217041a2ff752d5e091aaa557dc5ddcdc244a96f2e784a85d328

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream utilizes `eval()` and `String.fromCharCode`, indicating obfuscation. The ML classifier strongly suggests maliciousness. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, as suggested by the 'Suspicious extracted artifact' heuristic. No specific family could be identified.

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_obj0001_000.js` `c7535b16073e1e0a425aae7e4c3ddc899c59f6a85f03948b74e2c6a422ea6374`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	885 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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