PDF malware analysis — malicious · 917dcd6f3d45072b

MALICIOUS

PDF

2.8 KB

MD5: bd88ca37100f8bdd44397725ba69f002 SHA-1: a5b0c00cc3db2ca84f7491cc53d9508730cb61b9 SHA-256: 917dcd6f3d45072b660a5583ef459856b878da74b67771c256b35162de21c2dc

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests the use of eval(), a common technique for executing obfuscated JavaScript. The PDF_FROMCHARCODE heuristic further points to obfuscation. The embedded JavaScript streams, named javascript_obj111611_000.js and javascript_obj111612_001.js, are likely responsible for downloading and executing a second-stage payload. The lack of specific IOCs like URLs or hashes in the provided evidence limits the confidence in family attribution.

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_obj111611_000.js` `bc62495c28e5b9d5cd6f064674f55e71b16e79c6eeb1f38c5d2affed148eee89`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `dcdace03a45058bc71c28c6266e1bb611d4244493870f41f93d80b0e69dd79c0`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	3269 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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