PDF malware analysis — malicious · c77c93dde74cfbd5

MALICIOUS

PDF

8.3 KB

MD5: f9ce327496f1aae72dced580349579e0 SHA-1: 1db6624c42bba2dbb153779e96649c25ff03849c SHA-256: c77c93dde74cfbd58c954b05d90ec9037c5a5e54e668ba2170a2553193513303

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

This PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript streams. The JavaScript appears to be heavily obfuscated using eval() and String.fromCharCode, making it difficult to determine the exact payload. However, the presence of these obfuscation techniques and embedded scripts strongly suggests an attempt to download and execute a secondary malicious payload. The extracted file names 'javascript_obj0008_000.js' and 'javascript_obj0008_001.js' are included as IOCs.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
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_obj0008_000.js` `c240b3003fc6b2d4589b502ea6522de6ba20dc686f57461dd02f90cb69fceb74`	pdf-javascript-stream	PDF /JS object 8 at offset 0x23A	7762 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).
`javascript_obj0008_001.js` `54b602dbcb3c74cff9a5bbda1f457ad31ca63037ac81c3ac366a949ad0c605af`	pdf-javascript-stream	PDF /JS object 8 at offset 0x23A	7298 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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