PDF malware analysis — malicious · 0e843e69a960611d

MALICIOUS

PDF

13.6 KB Created: 2008-90-54 32:76:00 Authoring application: aHEDa3Sc (via az2sFLxX3MKIRu)

MD5: a601123eedfc0c7d49a3364b2b4fea7e SHA-1: 9b69c1d31a864b70226c47ee9ecd4382166def50 SHA-256: 0e843e69a960611d708fa61b075039990097eb8cbd2a033a5df60bb6934a93f2

118 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT' and 'PDF_JS_EXPLOIT_CLUSTER'. The ML classifier strongly indicates maliciousness. The JavaScript, though truncated and obfuscated, is likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload, as suggested by the 'ML_NYX_PDF_MALICIOUS' heuristic and the presence of a large embedded script file.

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.
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)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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_obj0013_000.js` `79dacdbb0a2f2d91594ad6090993e740d60e9de65883f52a0e37e029f4cde1a9`	pdf-javascript-stream	PDF /JS object 13 at offset 0x380	1002968 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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