PDF malware analysis — malicious · 97d19b88e0a6791a

MALICIOUS

PDF

4.1 KB

MD5: e07e9837c9fef236cd6daeb0d6c4e4c7 SHA-1: 4ae7c0133016599f3bb49892d3c94b583fc4ccad SHA-256: 97d19b88e0a6791a389b1ac6057f04a1e4868851bc97e2c9fbaf4c2b4b7e9b68

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is heavily obfuscated and utilizes eval() and String.fromCharCode() functions. The ML classifier strongly indicates maliciousness. The primary intent appears to be downloading and executing a second-stage payload via the obfuscated JavaScript, as suggested by the heuristic firings and the presence of deobfuscated JS files.

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` `5a0c1c76e4d177a2732ee9f99d22e684207e639f4982311f56c73bcf6c88ae42`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6421 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` `73c8daea05625d98179cab476cc83daa77d85d82134c575910734fb3022e3291`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3661 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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