PDF malware analysis — malicious · f22e468a0f8fc7e6

MALICIOUS

PDF

4.1 KB

MD5: d77c9bf45334d20b2d4ba14be40a4132 SHA-1: 1d8e1c53d73ab6707a714a73c0bab2308a1151b0 SHA-256: f22e468a0f8fc7e6a254a91b0117268f8fbceb35d7e2dbdae42def3041ae2e69

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed embedded JavaScript, including obfuscated code utilizing `eval()` and `String.fromCharCode()`. The presence of two JavaScript artifacts, `javascript_obj0013_001.js` and `acroform_b64_00.js`, suggests a complex execution chain. The primary intent appears to be the download and execution of a secondary payload, typical of many PDF-based malware delivery mechanisms.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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_obj0013_001.js` `4c47a0e8bd8e9532ae4ead9a77a42f61da414ef85374dc1223cf2047efe3b249`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6305 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `5535ee18096f378a14c8b223ae35a2b57bc5f27902e358793a9ee08270785f1e`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3575 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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