PDF / .TXT malware analysis — malicious · d209e9dfb231caa6

MALICIOUS

PDF / .TXT

4.1 KB

MD5: 5c2c4610b888d308a109a9f560db626d SHA-1: f3afce00f3fa4869f87c8f0188178b14e9c30680 SHA-256: d209e9dfb231caa668e81ce2b34702fc7bb47408a76c9dc90100a8ef6d7ad029

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript streams, with one stream exhibiting high-confidence indicators of obfuscation and eval() usage. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' as extracted artifacts, coupled with the 'PDF_EVAL' and 'PDF_FROMCHARCODE' heuristic firings, strongly suggests that the script's primary purpose is to deobfuscate and execute arbitrary code. This is a common technique for downloading and running further malicious payloads.

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` `86fc74624b092865fd9963a068c3166fafc702d45b79e4910359ddf8452ed5fe`	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` `2156a81d2005bd5447d4c560976cc43645749d06f75641e53f98326af3927a2f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3589 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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