PDF malware analysis — malicious · c1019d05aca84757

MALICIOUS

PDF

14.6 KB Created: 2009-09-19 19:42:94 Authoring application: PDF Library 9.8.2 (via PDF Library 3.1.3)

MD5: c52d02749ccc38c5c09586552117c652 SHA-1: 28ee83356ec2bbe30ef2d2e4c62dcfcdfb256bfc SHA-256: c1019d05aca847578cc95b06122dcf004c0ec217d5930c5d6e3465a831c69a9c

118 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, which is flagged by multiple high-severity heuristics including PDF_JAVASCRIPT and PDF_EVAL. The ML classifier also strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0007_000.js', is highly obfuscated and likely responsible for downloading and executing a secondary payload. The PDF structure itself shows signs of obfuscation via ASCIIHexDecode filters.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0007_000.js` `2c12ad00b244c710d1a71d803833d2d608d873bbd14c0be4f527d4b99c67b297`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	109904 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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