PDF / .TXT malware analysis — malicious · a3b03958df26e1d9

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 710d7a8f228cb4a364688c3f426a7511 SHA-1: 4e49f2e65f32edb458321cda384f85b46fb8a560 SHA-256: a3b03958df26e1d9941195b53ae33451755c9d10148ac72a2ae6d24417aac022

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, found in acroform_b64_00.js, likely attempts to download and execute a secondary payload. The presence of eval() and String.fromCharCode() suggests code obfuscation to evade detection. Due to the obfuscation, the exact payload and delivery mechanism cannot be fully determined, leading to an 'unknown family' classification.

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` `f59d7d4638c1b09dcf251ea410b9c4fada99e189024b54914fd033f230257c22`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6293 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` `6410dc9da360836b3c74172a30cc88b1855d2d9f85fb7409563d7fe54edb65d3`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3566 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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