PDF malware analysis — malicious · c6790f0cd1488c55

MALICIOUS

PDF

15.6 KB

MD5: 90458488168f809787bd05c0dea47146 SHA-1: 22ffa12db229e2faea61322446bde2f1b91e74b2 SHA-256: c6790f0cd1488c554879fdd99074f17bf1599299501f5238c86fc528d7e79d42

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. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() for execution. The extracted JavaScript files, 'javascript_obj0004_000.js' and 'legacy_pdfkit_stage_000.js', are likely responsible for downloading and executing a second-stage payload. The lack of readable document body text prevents a more specific determination of the lure, but the technical indicators point to a malicious downloader.

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_obj0004_000.js` `2563d01b76edd1988314067b3b392d15f90ebdf511d59463803c6870284599a1`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	297 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `18d065bcd44e6aa2fd796205c31d4d36c89322365d2a5c55e33e74ee68e6ff87`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1AAB	11532 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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