PDF malware analysis — malicious · 8f929b6538461313

MALICIOUS

PDF

10.9 KB Created: 2010-08-04 17:50:07 +04:00 Authoring application: gXJsY0_ (via c19fa3728a)

MD5: 04a82f084e8e61bcc513fe738e983b01 SHA-1: 1b989663d8dc1aa1cf2c5b8dac693c30bc005e98 SHA-256: 8f929b65384613139e65a966c792861d9ad52285692d931382171277bf43e237

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier also flagged this PDF as malicious with high confidence. The presence of JavaScript streams and the use of eval() suggest the script is designed to execute arbitrary code, likely to download and run a second-stage payload. The document body is unreadable, but the technical indicators point to a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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)
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` `3e32c1d85e8e59c76d139ca616b3b8c559cf112ce113a1ba4b6a1f35aee6fe43`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2441	512 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x25A7	193 bytes
`javascript_obj0015_002.js` `095275bc05a7565d950d4b4c8bab7bb7baab6215d3b0ff66411b2b53c7cde7dc`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26A8	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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