PDF malware analysis — malicious · af7e4e78e281ff9f

MALICIOUS

PDF

10.2 KB Created: 2010-07-13 16:58:26 +04:00 Authoring application: cNCjY (via bfbf0)

MD5: 1c885bceadb7e5c3b3bd6e9bf6933015 SHA-1: b25f54d08c4cddc86a21dd59fa77a83d3538eb22 SHA-256: af7e4e78e281ff9ff6c61eb470960c8b97a4b274b3067d710043f58c9db81292

64 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier strongly flagged this PDF as malicious. One of the JavaScript objects, 'javascript_obj0011_000.js', appears to be obfuscated and likely contains code to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams points to an exploit attempt within the PDF structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `acf218adfaef524ff2fed04a2c8e5a3c50478449664ebe625f99004066791326`	pdf-javascript-stream	PDF /JS object 11 at offset 0x219F	638 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `d0b61e244b5f04f4eece72cc0ce250ceec58a0598194990c0cbe819c2f34f314`	pdf-javascript-stream	PDF /JS object 13 at offset 0x234B	49 bytes
`javascript_obj0015_002.js` `f389f89628d0ba1e827b9dd9a8d22e6728f9ca7db46bd58530bb1b068b5561e9`	pdf-javascript-stream	PDF /JS object 15 at offset 0x23F5	60 bytes

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