PDF malware analysis — malicious · 037c0e640a70b713

MALICIOUS

PDF

5.1 KB

MD5: 6d706e436856223a2690fe51abb3d44b SHA-1: f8377f99d7875fedf5178cd99ef1be856397b23d SHA-256: 037c0e640a70b7132a73b4a9b246b5d01ea3e717611dab89d3f0a8f4c69d1a94

156 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript which is heavily obfuscated but utilizes eval() and String.fromCharCode, common techniques for malicious scripts. The script's purpose is to download and execute a second-stage payload, as indicated by the ML classifier and heuristic firings. The obfuscated nature of the script and lack of clear indicators for a specific family lead to an 'unknown family' classification.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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_obj457691_000.js` `f3d71afebd8703847a87300de971867c3d4e8eb60f7639ff867d87605fdee9d1`	pdf-javascript-stream	PDF /JS object 457691 at offset 0x138	8371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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