PDF malware analysis — malicious · 8ad9c2c35a0aaccb

MALICIOUS

PDF

15.6 KB

MD5: 3b6ceab1b74d3f3ef48b48d610642c56 SHA-1: d4b94b36adfc73f3af5b054025fbe415e4d36301 SHA-256: 8ad9c2c35a0aaccbaa290358904e882d14c2330a2009632c4ad712589bfca8f3

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a call to eval() and String.fromCharCode, indicating obfuscated code execution. The heuristics suggest this JavaScript is designed to download and execute a second-stage payload. The presence of two JavaScript files, one deobfuscated, further supports this. The exact payload and delivery mechanism are not fully discernible from the provided evidence, leading to an 'unknown family' classification.

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` `19be3d996207f4079b084b569aaf96ee282b2f4ab20e93c3f528c51bfa1234c9`	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` `a1e278df22599d140d302fbd3468a04770d7e881a1599fab3e7405036cbcdef1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1A66	11929 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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