PDF malware analysis — malicious · 1d42b8d45cda0d63

MALICIOUS

PDF

7.6 KB Created: 2009-10-10 19:48:91 Authoring application: PDF Library 4.10.4 (via PDF Library 1.1.7)

MD5: 014cc583c4e008ea50573b95f0d2a1d0 SHA-1: f36bdbb9453260ddb4a06712460cf38dfa876203 SHA-256: 1d42b8d45cda0d63b278f1d81dfd1a7f92bdc71aea743c26bcf6880e240e683c

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by a machine learning classifier as malicious and contains embedded JavaScript. The JavaScript stream is likely responsible for executing a secondary payload, as indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristic firings. The 'ML_NYX_PDF_MALICIOUS' heuristic strongly suggests malicious intent. The presence of ASCIIHexDecode filter with exploit indicators further supports this. The extracted artifact 'javascript_obj0007_000.js' is a key indicator of the malicious script's location.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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
Suspicious extracted artifact medium 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.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `c6723c444fc13af92309667337bdf656ab6372af4f5138663ce0399e83ac4b70`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	37065 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long hex-escaped blob(s).

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