PDF malware analysis — malicious · ae5d59e943c3cf44

MALICIOUS

PDF

740.9 KB Created: 2010-02-22 08:19:16 +08:00

MD5: 7ed9b15a957d0d09c63a7f5c49b504f7 SHA-1: 3892c14d6e157ec95d05794c42018867db04bd7b SHA-256: ae5d59e943c3cf44a8bfdf914fcd6e3a9a07a753532596bccf01fdbcb438261b

234 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1559.002 Component Object Model

The PDF file contains multiple embedded JavaScript streams and a Flash object, indicating an attempt to exploit vulnerabilities. The presence of `eval()` calls and `String.fromCharCode` in the JavaScript streams suggests obfuscation and dynamic code execution. ClamAV detection as 'Pdf.Exploit.Agent-35955' further confirms its malicious nature. The extracted artifacts, including SWF and JS files, are likely components of a multi-stage attack designed to download and execute additional malware.

Heuristics 10

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`jVtTngBkmcyI.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 5 at offset 0x1518	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0012_000.js` `a8e9a031915fc297bf10a6ec84576b5b55a9de0263ee4db0e5604573a17731a2`	pdf-javascript-stream	PDF /JS object 12 at offset 0x3CD	9494 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0028_001.js` `70c940ca448d03dc56836c5dd011e2433261e89c9ce18ff31ddad7a53b4ae68c`	pdf-javascript-stream	PDF /JS object 28 at offset 0x8CC3	18151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`stream_003_off0000a650.js` `2367546f87cfc66c345c8052bc47dc6a913568270ded3a1205332654caaacb46`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xA650	18141 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`stream_004_off0000b106.js` `c0e38d722bd9b31a34628e97175d110ace6a501de318162a65eb6f2b706afc2f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xB106	9482 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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