PDF malware analysis — malicious · f42e4377ec7c227a

MALICIOUS

PDF

4.0 KB

MD5: 0129f8f3119a96f3515b2ab2058f9704 SHA-1: f03e85022cddb71056673d13641235a02bc64857 SHA-256: f42e4377ec7c227af9ab39e3ca7fe5e355891fe7cdecf95336493d77ce1c09d0

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests code obfuscation and execution. The ML classifier strongly flagged this PDF as malicious. The deobfuscated JavaScript file 'acroform_b64_00.js' is likely responsible for downloading and executing a secondary payload, a common technique for initial access.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_001.js` `aec9432bb7a34b99b2f273892bb72a4aec15a6e4771b2dd1a003c748981fdb2e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `c6704ecc52344971cf5ead1e9c4406ec0ffa27bcda7beac39528942b36c3c0bd`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3569 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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