PDF malware analysis — malicious · 6a67448aa343977e

MALICIOUS

PDF

11.5 KB Created: 2011-01-19 22:29:24 +03:00 Authoring application: w___A9 (via 8f02e3fa67)

MD5: bb242ef990b347ae0ad0ca9b71494d78 SHA-1: 36f4d33a83b67877f4096da99dd3cd13a8136763 SHA-256: 6a67448aa343977e8c8ace589393246071275c9a2a5e796a751f9710d6292671

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple JavaScript streams, with one stream utilizing eval() and String.fromCharCode() for obfuscation and execution. This indicates an attempt to execute arbitrary code. The script `javascript_obj0015_002.js` directly calls `app.doc.eval(ACR_R1__(rdVmK__(TruW62_), 'bPh___J'))`, which is a strong indicator of malicious JavaScript execution within the PDF. The specific values 'GA__LEJ' and 'bPh___J' are likely deobfuscation keys or identifiers used by the script.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `01489f2e6f1188723d2d2584e634a005a30cd948f2dc03f19d04db9729a2b5b3`	pdf-javascript-stream	PDF /JS object 11 at offset 0x24A3	1101 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `76ee1508ebab8f6f7f7cb3ca456aa81f043bbdced931296b22963203bff3ff4a`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2734	502 bytes
`javascript_obj0015_002.js` `64611ff7ff747bec802daa2493caf51c28f4d128efca70d252e7e7f74d150dd4`	pdf-javascript-stream	PDF /JS object 15 at offset 0x28D5	148 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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