PDF / .TXT malware analysis — malicious · f9d1fecc2c500a1a

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 01d56a1ab1a5ff80cf6f0b3fb0cd3ffc SHA-1: da99d35ce857d1d0be22533f2247074968b7c9e8 SHA-256: f9d1fecc2c500a1afe6ba0c545be45711b92c832003d5a68b3a907bec0fdfba7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript streams, specifically 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are heavily obfuscated, suggesting an attempt to hide malicious functionality. The presence of eval() and String.fromCharCode calls within the JavaScript points towards dynamic code execution, likely to download and run a secondary payload. The overall attack pattern is a JavaScript-based PDF lure.

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` `3f2f467f3dc136b785a03f56cfe0b125ed2c47ef084fcca485ff961d7a791c3e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6273 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` `981ba70401c26eb7ac17a9c728e329240fb6d1c6588d6244fdfd8593c224570f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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