PDF malware analysis — malicious · 34fdae81eecc01bc

MALICIOUS

PDF

34.5 KB

MD5: fcb452765f047cd51014814a8b60ecd8 SHA-1: 6267c928e46855dd648036fdeb3023128326b3a2 SHA-256: 34fdae81eecc01bc1e8f24d29bd3a67c559c7d6a7ef37031008c2dd0f428823d

104 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The ML classifier strongly flags this PDF as malicious. The presence of an eval() call within the JavaScript stream suggests code execution, and the extracted artifact 'javascript_obj0022_001.js' is likely part of this malicious payload. The document body is unreadable, but the technical indicators point to a vulnerability exploit.

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.
ASCII85Decode filter (with exploit indicators) low PDF_FILTER_85

ASCII85 encoding filter present alongside exploit delivery indicators — uncommon outside of obfuscation
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0020_000.js` `8617feb1498d0fab28e222205a536902fc7144d2526ce0e0a8bbd5a298158fb1`	pdf-javascript-stream	PDF /JS object 20 at offset 0x280C	36400 bytes
`javascript_obj0022_001.js` `f8efec017e45f1f92bfecb9d57aef7c7eafeaa6ff333ea10f95097c5dc61360a`	pdf-javascript-stream	PDF /JS object 22 at offset 0x8311	1814 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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