PDF malware analysis — malicious · f0886362b875c07e

MALICIOUS

PDF

8.7 KB Created: 2009-07-29 21:02:58 Authoring application: FmuXaCOXjqxG (via fxJEFwZsqthqryofVmOEl)

MD5: 925b7416957eee1ccfb2d46205fbcdff SHA-1: df47351f6c2e3b32cfb42fdbe3585a4d0b3f658c SHA-256: f0886362b875c07e2e736b4a6860e4366325ccb9cd9015653ebf217b813375d6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The high-severity PDF_EVAL heuristic firing suggests that the JavaScript is being executed, likely to download and execute a second-stage payload. The obfuscation indicators and the use of String.fromCharCode further support this. No specific family could be identified due to the obfuscation.

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `2d233e54f9a2aecc405fc4cb34a617ef38eb983bf823de18c59f376f50b65a1c`	pdf-javascript-stream	PDF /JS object 7 at offset 0x391	6070 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`javascript_obj0007_001.js` `c4f65df816a5720c2a38e23533f7264928c5d6cf0fe09e8b563324e531ee2407`	pdf-javascript-stream	PDF /JS object 7 at offset 0x391	2750 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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