PDF / .TXT malware analysis — malicious · 51a20749dc80b39c

MALICIOUS

PDF / .TXT

4.0 KB

MD5: d4e5003081b494b2b87d4ba4b306c959 SHA-1: da0d90cc7378499b83962770143b1594a8b171a8 SHA-256: 51a20749dc80b39c9fdc283579301f3d793160ded08f843a7240313ad04e4f62

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 deobfuscated JavaScript, found in 'acroform_b64_00.js', likely attempts to download and execute a second-stage payload. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscation techniques common in malicious scripts. The extracted file names 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are suspicious artifacts.

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` `f9a03b5d1136636fdd573d4c8a5a06879a59171d036237ee6724b8473f86c150`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6413 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` `ea986fd57342a7cd470e1f32df4af20ab221246e3c8aadc624c91f3c12155479`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3657 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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