PDF / .TXT malware analysis — malicious · bb96a24f94748ed4

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 49d86a5391007fcf7ef7e080c319890c SHA-1: 1f8ffa31c6c0e59330aee3c1ea1f4d6bd5e5f9a3 SHA-256: bb96a24f94748ed498b3de9abf1e1caa828587fad461b2039fb2d09e534714f5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of PDF_EVAL and PDF_FROMCHARCODE firings suggests that the JavaScript is obfuscated and likely used to execute arbitrary code. The deobfuscated JavaScript stream (acroform_b64_00.js) is suspicious and points towards a downloader or dropper functionality. No specific family could be identified, but the techniques used are common for initial access and payload delivery.

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` `2080b9f3aaa39cd29ff834bac08fa4582237c0ae4286fb815326ab4acf1c53f5`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `3f78448c6f8bb14b8967c6195004f5f0b47f38aff40a03d58f718810083f3289`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3600 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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