PDF malware analysis — malicious · dc969b03e81e6896

MALICIOUS

PDF

11.3 KB Created: 2010-10-10 06:32:06 +04:00 Authoring application: AHKlHb (via 81970)

MD5: 548d7ea4c71d3511bfdfa1c51e66f727 SHA-1: 4665125b190b03372d12064832054dd637d4ace2 SHA-256: dc969b03e81e68967deff8c9d8f823263618690ffb76f0ea17f9c61c7af1a6f1

114 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_EVAL' firing specifically points to an eval() call within a decoded stream, suggesting code execution. The presence of 'String.fromCharCode' further supports obfuscated JavaScript. While the exact script functionality is not fully detailed, these indicators strongly suggest the script is designed to download and execute a second-stage payload. The PRC/3D content is also flagged as suspicious.

Heuristics 7

PRC/3D content in PDF high CVE related PDF_PRC_3D

PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0011_000.js` `6d39805e855a794ab1260eafe0a9e81fa63579fd8d86beede3e14971b05e8f49`	pdf-javascript-stream	PDF /JS object 11 at offset 0x2388	1159 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`javascript_obj0013_001.js` `6953ac372399fe0ce1e80de41a3239b0d1e7fa466af72d7ebe275ed93a6bfbcb`	pdf-javascript-stream	PDF /JS object 13 at offset 0x261D	505 bytes
`javascript_obj0015_002.js` `9f5c6d46049cdcc94a0e77047e7a65e6131045a6788a76e65274c52bee55d158`	pdf-javascript-stream	PDF /JS object 15 at offset 0x27B4	132 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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