PDF malware analysis — malicious · 7f20a71bb8e18377

MALICIOUS

PDF

34.6 KB Created: 2010-01-19 14:17:59 +03:00 Authoring application: moreThose (via e3ea33961a7c5b1ec04d6c97aa3b5379)

MD5: be30f13a0601ea9b57ae55cc74c8a5f0 SHA-1: 8b0b4510021210b54c16507606a72c28923c0e25 SHA-256: 7f20a71bb8e183774bf0d55bd33274f6e467ad98dea3155234131aa38082581e

224 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript that utilizes eval() calls, indicating an attempt to execute obfuscated code. This JavaScript is likely responsible for exploiting a PDF vulnerability to download and execute a secondary payload, as suggested by the 'PDF JavaScript exploit cluster' and 'ML classifier flagged this PDF' heuristics. The ClamAV detection of 'Pdf.Dropper.Agent-7276762-0' further confirms its malicious nature as a dropper.

Machine Learning

Nyx PDF Classifier malicious score 0.9979

Heuristics 8

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-7276762-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7276762-0
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_obj0018_000.js` `2cf4158bf838ff56a3e440a0c3e65c49a4d608830b04149a198f17f6ef026a6d`	pdf-javascript-stream	PDF /JS object 18 at offset 0x228F	36564 bytes
`javascript_obj0020_001.js` `31783f825473f68e9aa3ef9e2575ca3ab7716503f4c99ff46f04fad58b918ea0`	pdf-javascript-stream	PDF /JS object 20 at offset 0x7F37	1496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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