PDF malware analysis — malicious · a2e8b3f6d5251e4a

MALICIOUS

PDF

16.3 KB

MD5: 5bf453f039255c8ab7379d739f7d1af5 SHA-1: 714e2263cbc26ef9a44ec39ac2c288b3c52c597f SHA-256: a2e8b3f6d5251e4a87f1c97ec0e9622d43b7fc306693d652a86ab20aaf1d5ae7

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1105 Ingress Tool Transfer

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The JavaScript utilizes eval() and String.fromCharCode() for obfuscation, a common technique for malicious scripts. The primary intent appears to be downloading and executing a second-stage payload from a remote source, as suggested by the obfuscated script content and the nature of the heuristics. No specific malware family could be confidently identified.

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` `7d7772c38750ceb5027f2fca9f75b7b4df9f40e67ad6ee175100f1104061663f`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	302 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` `1e2faaa5bfce56154f6eaefd91502c27f189c0ddeaa7cdcdf960ee82a1a2d9b1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1B6D	12403 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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