PDF / .TXT malware analysis — malicious · d7d479bbff7ad3f1

MALICIOUS

PDF / .TXT

4.0 KB

MD5: 54d0181d3389fe5878613bc711b185c3 SHA-1: 4015007ec3f9904b7951e7afcdfa56a29164980e SHA-256: d7d479bbff7ad3f1266cb2e7e88c03b7fb5cfbaa67a82f5520fc469aedf8b55f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of eval() and String.fromCharCode suggests obfuscated JavaScript code designed to execute arbitrary commands. The extracted files 'acroform_b64_00.js' and 'javascript_obj0013_001.js' are likely part of this malicious script, which probably downloads and executes a second-stage payload. The high unknown_exploit_score further supports the presence of exploit code.

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` `97965ae178d1a8ae8fef791f5a15679e3cc0305d83b3cf5b60320daac6a0182d`	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` `0d98772322eef31b52a8bc198602a3400138522d8af6ee17fc21b06ee592ea20`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3589 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).

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