PDF / .TXT malware analysis — malicious · 8fb0a447c52be6dc

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 7212593c64156db9d5584319d461531b SHA-1: 76400932f751cbfb8d209356a25a3b3545280743 SHA-256: 8fb0a447c52be6dc00612dac0590fba32042a6934ee4013ae11762d274c012f0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing and the 'acroform_b64_00.js' artifact suggests that obfuscated JavaScript is being executed, likely to download and run a secondary payload. The 'String.fromCharCode' usage further supports the obfuscation. Due to the obfuscation and lack of specific IOCs beyond the embedded script names, the family is unknown.

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` `015948be694aa21431baecb762d4888952481ebdeedcc9315b7ddf54f532fe85`	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` `fbd73510e6b2690a72f7e63e8996872c659919c2f9c2d87a849865cc2578aa24`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3567 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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