PDF malware analysis — malicious · c22511dff10a85b7

MALICIOUS

PDF

60.5 KB Created: 2009-06-16 00:49:08 Authoring application: fwyvjAKyJralyojQU (via bczOHFVAozLwHLdOHVf)

MD5: 081c04dcca40fe22f5791a600c94b9ab SHA-1: 6327189d34027a1cc076f278c18482923a95b80f SHA-256: c22511dff10a85b7663f4a303105073e2bf0c8f8b3bbe4d3c02337be372b011c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file was flagged as malicious by a machine learning classifier and contains embedded JavaScript. The JavaScript stream is obfuscated and uses `eval()` and `String.fromCharCode()` which are common techniques for hiding malicious code. The primary intent appears to be downloading and executing a second-stage payload from the embedded artifact 'javascript_obj0007_000.js'. Due to the obfuscation, the exact download URL or execution method could not be definitively determined.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

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` `28a47c10d8d3ff894b95e521711080bf30decda57731bcb2bb403083d53c1147`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4D2	59994 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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