PDF malware analysis — malicious · aae8f987f42827a9

MALICIOUS

PDF

16.3 KB

MD5: 6a149a4d470a5ecb026da3cf06963879 SHA-1: 58aa28ccc23136536bd8188056d6224e012f6f46 SHA-256: aae8f987f42827a9280d6b60af57019fcbd819c948cb1575d9d7ab3a7f79784d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call and uses String.fromCharCode(), suggesting obfuscation and dynamic code execution. The primary function of the script appears to be downloading and executing a second-stage payload, as evidenced by the high confidence heuristic PDF_EVAL and the presence of deobfuscated JavaScript. The obfuscation techniques used and the lack of specific indicators prevent definitive 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_obj0004_000.js` `66600cb943e271f65b92a2b47ac981c59fd7b47c7c3e720e85904c31715883b2`	pdf-javascript-stream	PDF /JS object 4 at offset 0xE1	305 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 0x1B6F	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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