PDF / .TXT malware analysis — malicious · 281afb4645cc1e30

MALICIOUS

PDF / .TXT

1.9 KB

MD5: 906b523722843748fe120018eb79ca9b SHA-1: a19fa230da18f3e09336217e219ce8d889f8e548 SHA-256: 281afb4645cc1e30d7ff140e052aa8281c10c03f17235fb634ba10108bbe662f

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 Service Execution: JavaScript T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval(), unescape(), and String.fromCharCode() functions. The heuristics indicate that this script is designed to execute arbitrary code. The presence of obfuscated JavaScript streams and the use of these decoding functions strongly suggest the script's purpose is to download and execute a second-stage payload. The extracted file names 'javascript_obj111611_000.js' and 'legacy_pdfkit_stage_000.js' further support the analysis of embedded script content.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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_obj111611_000.js` `0c76cda798ef77d3534d0ecfe9b37e2225dfe992b937194fe3020d8fc0ba3acc`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x670	295 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `9b1a001175e2cd895c5251e8d8613401b24239c8dc4fed8c409bc3fbf2bd8b4b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2828 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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