PDF malware analysis — malicious · f867462430c890d8

MALICIOUS

PDF

15.1 KB

MD5: 8c512f46ed832a3ed5bd564f082d2d2f SHA-1: 0d3a7d36f2a6b6fe5cfae3050795ec08975431c6 SHA-256: f867462430c890d8d21db1d5f8c2b8564e710a42e58cf4e1fb092c3c187ef8bc

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode(), suggesting obfuscation. The primary function of the script appears to be downloading and executing a second-stage payload from a remote source, as evidenced by the high confidence heuristic PDF_EVAL and the presence of deobfuscated JavaScript. The exact download URL or execution command could not be definitively reconstructed due to the obfuscation.

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` `a818fd8a9e1a89956d5098bd4e7bc169ae0ed69b3ea2381a3ad0504379168054`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	299 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` `5c14d9d31d1500ab8dd8073808b2c457b331d91cbcfd68ca3f434712329f98f0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x192F	12008 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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