PDF malware analysis — malicious · 54b5c5da2c4737d5

MALICIOUS

PDF

11.0 KB Created: 2010-07-22 17:22:21 +04:00 Authoring application: kM_k__Sh (via 02d35)

MD5: c8e653de9d2acb1ff0a9dd6e7f885b6d SHA-1: 4ec4bf56e713b0ad98eb0474dabdff3a433971eb SHA-256: 54b5c5da2c4737d5aeb01cdd203920801ffe91066ead1cfd843e7690a4f8bf61

74 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of 'eval()' and 'String.fromCharCode' suggests obfuscated JavaScript code is being executed. Two JavaScript files were extracted, javascript_obj0011_001.js and javascript_obj0015_002.js, which likely contain the malicious payload. The exact intent of the script is unclear due to obfuscation, but it is designed to execute arbitrary code.

Heuristics 6

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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_001.js` `89b16e94409334873ff8451bb5fd1ce24b8d8de404b0882c7a5565061a02ab83`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2390	509 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0015_002.js` `291bcb2bd688d562b1f74d4e6805593bcf8d13911e91fa091065cf4ebbc551ce`	pdf-javascript-stream	PDF /JS object 15 at offset 0x2611	45 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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