PDF malware analysis — malicious · bf47f7b53009d32d

MALICIOUS

PDF

292.3 KB

MD5: df2c90d3018b9484ee6fb5a63ebd81a7 SHA-1: f5c91fb18f13e84bcd29ded365eeab445dda4310 SHA-256: bf47f7b53009d32d2d73f1535361b36833b433483db47746d35b29c05ebf425b

76 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious File

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream, identified as 'javascript_obj0008_000.js', is highly suspicious due to obfuscation indicators and the use of String.fromCharCode. This suggests the script is designed to execute malicious code, likely downloading and running a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0008_000.js` `f5e00f81f735afd617189bd4f5d10e5f39f008c2eae49a93bd9d875e8f91f0dc`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1CE	99528 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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