PDF malware analysis — malicious · f3d84c15f2ae9682

MALICIOUS

PDF

5.1 KB

MD5: 866904f2f5652f9df8509d2226901bce SHA-1: f78057cc1192c4ac21d38039f83ae5d944dd3913 SHA-256: f3d84c15f2ae96824b189c4c7335d1a03e7a1bb91dfd6b274fc872509d2c42ff

66 Risk Score

Malware Insights

MITRE ATT&CK

T1027 Obfuscated Files or Information

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and String.fromCharCode. The heuristic firings indicate that this JavaScript is likely responsible for executing malicious code. The primary IOC is the embedded JavaScript file itself, which requires further analysis to determine its exact payload and execution method. Due to the obfuscation, the specific intent of the script cannot be definitively determined without deobfuscation.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0524_000.js` `fb8c872575cd064959cd5a4bf4c0319d71687576c1f808a60f59d92fbfad3a67`	pdf-javascript-stream	PDF /JS object 524 at offset 0x133	8335 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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