PDF / .TXT malware analysis — malicious · 4ddcec34e4d254bb

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 1e2eb721b3425263d4f94c34554f83e1 SHA-1: bf062a0474b3fcad92b2f1e612838492111df54b SHA-256: 4ddcec34e4d254bb715f05a487c37cf7b77532fde0a58a42791c2386b8cc3256

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 JavaScript stream includes an eval() call and uses String.fromCharCode(), suggesting obfuscated code execution. The heuristic EXTRACTED_FILE_STATIC_TRIAGE further supports this with 'Script obfuscation indicators'. This pattern is commonly used to download and execute a second-stage payload. Confidence is moderate due to the lack of specific IOCs like URLs or hashes in the provided evidence.

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` `6f4727a5cb6e3ad0f4cbe99551cdbf54a2dc2333d6cfe8214dafb7591ccb2239`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6373 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` `7f1765a7b1f7bee00d64f05ae0580b193a076c17a5f6531b3978a6492b8e601c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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