PDF malware analysis — malicious · 6e26fb6b7e5a1f18

MALICIOUS

PDF

11.0 KB Created: 2010-07-25 17:05:07 +04:00 Authoring application: LyNfhQ_ (via 226d1f15ec)

MD5: 05ba0a9861e1e96d7f8ea8689bc42947 SHA-1: 8a09b6b0fb707caf742e524ea5af087a3b990a96 SHA-256: 6e26fb6b7e5a1f18e394f6d226d43f9611572dfa4968b86c204997d705355975

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript that is heavily obfuscated. The script utilizes String.fromCharCode and eval() functions, indicating an attempt to execute arbitrary code. The primary script decodes and then evaluates another script, which itself appears to be XOR-encrypted with the key 'FxCZZtNL'. This chain of obfuscation and execution strongly suggests the PDF is designed to exploit a vulnerability and deliver a malicious payload.

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` `377ddb0c7e7b40839a1a5dc4e21dc4705961a0ab53bbdefb1515086611d5ee54`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2495	502 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `bcba5e4f4026cf2279324908a65bb249ef15e48842db1a8f6f43f01a549eab64`	pdf-javascript-stream	PDF /JS object 13 at offset 0x25FA	193 bytes
`javascript_obj0015_002.js` `09c5c4cc029c3a0a7b6ec76f4cfd33d06989af1c94b821b9ccd1b3ce45fabee8`	pdf-javascript-stream	PDF /JS object 15 at offset 0x26FB	47 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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