PDF / .TXT malware analysis — malicious · dfb5857d9f3f0e5e

MALICIOUS

PDF / .TXT

4.1 KB

MD5: cbd903a575b9d341118908554d474da9 SHA-1: 0292c4dac044c45ab1c426db0872848b9ff4459f SHA-256: dfb5857d9f3f0e5e1cfe259a2fb0287f8264d011a81b2c9a65eb452e1a1762bd

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. Further analysis reveals an eval() call and String.fromCharCode usage within the decoded JavaScript stream, suggesting code obfuscation and dynamic execution. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' as extracted artifacts further supports the use of JavaScript for malicious purposes. The script's likely intent is to download and execute a second-stage payload, which is a common technique for malware delivery.

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` `51c29bd4c28452bf621d8ba6328bd64a5477239c6c51b99f8df54f01b5c79a7b`	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` `70915324e212f50bd452829a53d86aec5bb9857cc276c0156945324ea9746954`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3590 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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