PDF malware analysis — malicious · a8f8ae9d3ca04265

MALICIOUS

PDF

8.2 KB Created: 2011-01-28 23:49:51 Authoring application: PScript5.dll Version 5.2.2 (via GPL Ghostscript 8.15)

MD5: d1a0c1d87d33215c22ce3189d02b9e73 SHA-1: 9bcdb92d4d226be33c3a423852da71de9b53f359 SHA-256: a8f8ae9d3ca0426545a383ebf0bc029f0ddfef5bb1527e6bc9a56ddccabdb4b7

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment

The PDF contains embedded JavaScript with a high-confidence 'eval()' call, indicating obfuscated code execution. This JavaScript is likely designed to download and execute a second-stage payload. The ML classifier also flagged this PDF as malicious with a very high probability. No specific family could be identified.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_004.js` `00d4b5f66d0c86638378dc1a59661648c2751d8153370ce128f01bf86322c6f4`	pdf-javascript-stream	PDF /JS object 1 at offset 0xF	1664 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`font_00_cff_off00000b89.bin` `83b91037abccd6d47ae8fb66c276820c48d4527c52aec00e30e01afcea3173db`	pdf-font-stream	PDF embedded font (cff) at offset 0xB89	2011 bytes

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