PDF malware analysis — malicious · 389bbda65c5f93e0

MALICIOUS

PDF

33.9 KB Created: 2010-02-01 16:57:58 +03:00 Authoring application: manyTypeAre (via 9a3f263a5e5f63006098a05cd7491997)

MD5: c81e37976992fb94b65d8987a2a9e455 SHA-1: 3d93bfd60a6a9f21b499b380a83a0f0a0390ccac SHA-256: 389bbda65c5f93e063f452ffc2a3e1b49d5645bc361a8de0d5bd505d234e411b

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including an eval() call, which is a strong indicator of malicious intent. The ML classifier and ClamAV detection further support this, identifying it as Pdf.Dropper.Agent-1828701. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Dropper.Agent-1828701 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828701
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_obj0016_000.js` `f47aa16576f6454c8b4c6611454d34d9f1210387f6a332c9e1c18e7afa874cad`	pdf-javascript-stream	PDF /JS object 16 at offset 0x208A	36049 bytes
`javascript_obj0018_001.js` `6bbf92d58f67d240575c885e983784585cd2199d4f60509e013b500d29600b13`	pdf-javascript-stream	PDF /JS object 18 at offset 0x7CBC	1430 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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