PDF malware analysis — malicious · 0aab6f2ff3739343

MALICIOUS

PDF

28.8 KB Created: 2010-03-16 03:18:32 Authoring application: YVS0gTq (via vgTcr9q7Ph)

MD5: df7cac802c9339b97838bb1856ac486b SHA-1: d5cfd5d2b668eb00e571a985a70c62ec9b6f07ac SHA-256: 0aab6f2ff3739343a7101a90396747c96323747033487738e4ca1205908bcd8e

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is heavily obfuscated and utilizes `eval()` and `String.fromCharCode()`. This JavaScript is flagged as a known exploit cluster, indicating it is designed to execute malicious code. The primary function of the script appears to be downloading and executing a second-stage payload, as suggested by the ML classifier and heuristic firings.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `0d0c7de22fe240e4b0be260500cfee46a45c7093cf03f372c146591f6786c7a5`	pdf-javascript-stream	PDF /JS object 7 at offset 0x247	28266 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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