PDF malware analysis — malicious · 21f9635802d0935b

MALICIOUS

PDF

4.0 KB

MD5: 01c74f90ba33018383a0c32bfa63d61f SHA-1: 32fe1d0eedc24f1a31806ab90c66b90ef0a29836 SHA-256: 21f9635802d0935b9275228decd1669bd95074799d4f2829dab2327ea1289b58

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript streams, specifically 'javascript_obj0013_001.js' and 'acroform_b64_00.js', are suspicious due to obfuscation and the presence of eval() calls. This suggests the script is designed to download and execute a second-stage payload.

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` `3fc226355224724802f6b2ed4b192acaa10bd3b9fbcd7cc4cbbe4c679dae5f62`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6257 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` `52707d8ff766b875a873b2083cc282f454ebde3fd5d15a7147e7e7852707643b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3538 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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