PDF malware analysis — malicious · 39b857d274e77fb7

MALICIOUS

PDF

33.8 KB Created: 2010-01-16 17:00:36 +03:00 Authoring application: ipsumDont (via 3946286620b2e1ed380a77193fb7add7)

MD5: ce0635626628d17cdfcb55ed9e46e9f3 SHA-1: 0ee7962850e1589a26352d1ea72eabfb9b08933b SHA-256: 39b857d274e77fb77ff8d9da86448a2b95de44d296d2d838c80efdb9fe8206b0

164 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 and ClamAV detection strongly suggest malicious intent, specifically a dropper. The presence of obfuscated JavaScript, as noted in the static triage, points towards the execution of a second-stage payload. The exact nature of the payload is not discernible from the provided evidence, but the overall pattern is consistent with a malicious PDF dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

Heuristics 7

ClamAV: Pdf.Dropper.Agent-5343074-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5343074-0
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` `97228506562013140da18ac2362b25f77ca1c44aaeb72eefe8adc8a264e77658`	pdf-javascript-stream	PDF /JS object 16 at offset 0x1E38	37140 bytes
`javascript_obj0018_001.js` `cf52e88fd83f4068560d76b468c3127c1160d619d7db63268c9035f25dd6a402`	pdf-javascript-stream	PDF /JS object 18 at offset 0x7A44	2099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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