PDF malware analysis — malicious · a51d8d7c8f16ae95

MALICIOUS

PDF

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

MD5: e22df8a454d262890b4eff4ff9d140fd SHA-1: 0911e09f98130a3efd9572c592052652393381b2 SHA-256: a51d8d7c8f16ae95701f86bce0491e616c68a5caada88337d11ceba26d5cd779

98 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF sample was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream utilizes `eval()` and `String.fromCharCode` for obfuscation, indicating an attempt to hide malicious code execution. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the obfuscated nature and the use of `eval()`. No specific family could be identified due to the obfuscation.

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` `2f02bc1d85c39f40f1c0c07ec03e4c98a98d0edf429123ee22756e8b6aa0f106`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	851 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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