PDF / .TXT malware analysis — malicious · 488e176b38f5bab4

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 6a8fdf9762dde6bc37a72526402553d5 SHA-1: 149a800a104455a435bfcb03dd477dfbfbe5cb80 SHA-256: 488e176b38f5bab4c1a05b2e20f463a5b0c66a6bedfe61975a73f18a0c48a579

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and likely uses eval() to execute code. The deobfuscated JavaScript, acroform_b64_00.js, is the primary artifact. While the exact download URL or execution command is not explicitly reconstructed due to obfuscation, the presence of these JavaScript elements strongly suggests a malicious intent to download and execute a secondary payload. The file type and the nature of the heuristics point towards a common PDF-based malware delivery technique.

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` `3089e9c651bd954b68168dca075b0438bf9e630d5c32af80a67a0c0ba2398ff1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6285 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` `7759c71da3e7ebfb4b7a8ba16a57a536c0b49b450b253c1726a1e25e75206b52`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3559 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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