PDF / .TXT malware analysis — malicious · d5a7f008a1449375

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 0890ecece07d59e8ec7b1c4eadb13e23 SHA-1: a881c4276867f57ef6af486c31254cef45a27435 SHA-256: d5a7f008a1449375247b9dba7b68c8bfe63f8263e1316c6604e9dd42fe80ae7b

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 deobfuscated JavaScript stream, 'acroform_b64_00.js', likely contains code to download and execute a secondary payload. The presence of eval() and String.fromCharCode() suggests code obfuscation. Without further analysis of the deobfuscated script's content, the exact payload and delivery mechanism remain unclear, leading to a moderate confidence score.

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` `eb43238902310428c877070239f3774c9882e2f260039dae55c9e6aeb30facab`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6353 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` `33df764158c870afd26d2528714309940f30e019f87e54f2663b9e1ac844184b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3610 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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