PDF malware analysis — malicious · dc45aa47c7e0e53a

MALICIOUS

PDF

4.0 KB

MD5: aee7d8e3a2be899596e5ed985e66b661 SHA-1: 4034a6ef2082a5b9253310d693eeb0a6cd886ad8 SHA-256: dc45aa47c7e0e53a0d29d363c5c919f2b8c92e1f4fb47a7408cbc7fd23ab39d2

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

This PDF file was flagged as malicious by an ML classifier with a high confidence score. Static analysis revealed embedded JavaScript, including obfuscated code utilizing `eval()` and `String.fromCharCode()`. The presence of two JavaScript artifacts, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', further indicates malicious intent. The script's primary function appears to be downloading and executing a second-stage payload, though the exact URL is obfuscated.

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` `5f352288d31fbf77657084a0aeb2efe638713e0b10804e58640a8f05cf652a0e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6237 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` `42be8e46634aa75eeaa3c0a99dcba70571e2eaffe361977290fd217ec933bd8d`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3525 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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