PDF malware analysis — malicious · 02c8c18e826f2707

MALICIOUS

PDF

31.5 KB Created: 2010-02-02 06:37:19 +03:00 Authoring application: overMore (via cc43cae8b2c9735749cb067be62f9311)

MD5: becff59f929b1a48af32c4278097c63f SHA-1: bef72d6b4b9110ab448f5c7374bf472628edfd26 SHA-256: 02c8c18e826f27070c1ae5e0f357a566736ad1ff6cc03fc515b59e52c363490b

224 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF sample contains embedded JavaScript, including obfuscated code that utilizes eval() and is flagged by multiple heuristics as a JavaScript exploit cluster. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically a dropper. The primary function of the embedded JavaScript appears to be the execution of further malicious code, likely a second-stage payload, which is a common tactic for PDF-based malware.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

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-7222923-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7222923-0
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_obj0014_000.js` `f021bd1c0f5b7ef5c5384d63c31c32f35f90e9eb96d09cb347ffbfece9ccd036`	pdf-javascript-stream	PDF /JS object 14 at offset 0x19DE	34775 bytes
`javascript_obj0016_001.js` `a8b7a8bf1ca67f7a3fc56fac390dc3b32e041d371791d7cb7d48d585f66b99be`	pdf-javascript-stream	PDF /JS object 16 at offset 0x732C	1514 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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