PDF / .TXT malware analysis — malicious · a3f20570f8297e21

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 9fd6f783fd5ea299d41a1678b3a15d45 SHA-1: b791b127684db3160e814839d4c737f1dc78a7ca SHA-256: a3f20570f8297e215ab589bc228631bfa41cbedc871ce080fd237ca608736fd2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript streams, specifically 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are heavily obfuscated, suggesting an attempt to hide malicious functionality. The presence of eval() and String.fromCharCode() further points to dynamic code execution, likely to download and execute a second-stage payload.

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` `023e2afa1f61457303de7665da30e556ecd40032a6c3101d44c4bd21f4e67e0b`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6337 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` `089767e38cccefcfd14604da7e16ba2651ad3f90d6e7a1a27b09ae1ada0de56f`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3599 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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