PDF / .TXT malware analysis — malicious · af49bcbe3ad04304

MALICIOUS

PDF / .TXT

4.0 KB

MD5: ecf4350c7e9ff72166a9adcd88480695 SHA-1: 77dcd673f709a96df4e2a953950d6b4a33a7abfe SHA-256: af49bcbe3ad04304940df72e810954605f80aac13b582eb0544e51f9fb27d516

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The 'acroform_b64_00.js' file, identified as deobfuscated JS, and the 'javascript_obj0013_001.js' file suggest the presence of malicious scripting. The PDF_EVAL and PDF_FROMCHARCODE heuristics further point to obfuscated JavaScript execution. The ML classifier strongly flags this PDF as malicious. The primary attack pattern involves leveraging these scripts to likely download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ee9ff6495580249cd53871d86722683c8f5295caa519ea3f4e03a1939a45fa4a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 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` `0d72c49fe68ea4db25f404c97bff1ab287e4a9aa2f01620322cfddc638345a32`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3574 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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