PDF / .TXT malware analysis — malicious · 39ea37486f0b9702

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 26d67bc748e3063310a7d53340f9353f SHA-1: 696d567248cc166ca89c4ebc3ddce88af34c7e20 SHA-256: 39ea37486f0b970217f0cbbbe3334219364bf8835eb046ad25c6345cc3217bcf

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is being used to execute arbitrary code, likely to download and run a second-stage payload. The deobfuscated JavaScript file 'acroform_b64_00.js' and the embedded stream 'javascript_obj0013_001.js' are the primary artifacts. The eval() call within the JavaScript is a strong indicator of malicious intent.

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` `e6c3360ca2b1c9c1da0e5b03f9abe05dfdcb3ddd10f3c845d5a3025b9a38e350`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6325 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` `b3c7a46d848101fa0151e682e35fbc3ab07b766ca089497e93984ce7c4a74456`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3591 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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