PDF malware analysis — malicious · 5a149a1ac78e6b15

MALICIOUS

PDF

27.8 KB Created: 2009-03-22 15:59:37 Authoring application: TkvRN (via UE48s)

MD5: 6355e72e562f52986c4faaf19f70476f SHA-1: 4fb666ff7c1af40d4b19864815977f53d875119f SHA-256: 5a149a1ac78e6b15c5cf1619cba810f6953f4e093e14384e280908f522a6efbf

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL heuristic firing suggests that the JavaScript is obfuscated and uses `eval()` to execute arbitrary code. The extracted artifact `javascript_obj0007_000.js` is likely the source of this obfuscated script. The primary intent appears to be the execution of a second-stage payload, though the specific mechanism is obscured. The `String.fromCharCode` heuristic further supports the obfuscation technique.

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` `c84ba99ea4bd6acdbe2b5315808962f392ad2c4926687456f79fe0777c415c66`	pdf-javascript-stream	PDF /JS object 7 at offset 0x242	27252 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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