PDF / .TXT malware analysis — malicious · a433259b82173a46

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 21c27e676fff28d9d3eef710db1f6d80 SHA-1: db462a90f0d478f589daa45e9dc12d461933995e SHA-256: a433259b82173a464d0253ccc2111bfd8101d62b9637821ec17d23a2738d3dfe

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The `eval()` call and `String.fromCharCode` usage within the decoded JavaScript stream suggest obfuscation and dynamic code execution. The presence of suspicious extracted artifacts like `acroform_b64_00.js` and `javascript_obj0013_001.js` further supports the conclusion that the script is designed to download and execute a secondary 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` `00ab5e56a58c9bd828f7c3aa009aba1aa965967b1377d9efbd5a7fb8d629ec25`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6393 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` `2dd60f9e0af478525c3bb669104894b46eb0510efa98f57e47e178cf0721725f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3640 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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