PDF malware analysis — malicious · 19cd398b26fe4e06

MALICIOUS

PDF

173.2 KB Created: 2011-10-24 21:24:32 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: 979c64214f11f72edddd04ffc4887bb5 SHA-1: bde1e856a05e04eca6eb8a2eedf0d235622849dd SHA-256: 19cd398b26fe4e069757a166836ea33fb23bce40fcb4aeacc232726d5c1f707e

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious Link/URL

The sample is a PDF file that contains embedded JavaScript, indicated by multiple PDF heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. A critical heuristic firing for CVE_2009_4324 (media.newPlayer) suggests exploitation of a known PDF vulnerability. The ClamAV detection as Pdf.Dropper.Agent-7234692-0 further confirms its malicious nature. The embedded JavaScript, specifically the use of eval() and unescape(), is likely used to deobfuscate and execute a malicious payload, potentially downloading additional malware or establishing a connection to a command and control server.

Heuristics 8

media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324

PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009.
ClamAV: Pdf.Dropper.Agent-7234692-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7234692-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits
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_obj0008_000.js` `7a97ac86ccb25ded0688173ad61f89612239618e9cf53c5bbb1ef7f97d96cb3e`	pdf-javascript-stream	PDF /JS object 8 at offset 0x58F	1296 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 10 eval/decoder/string-building token(s).
`font_00_sfnt_off00022ea6.bin` `02813101e3e960192409cf3bb73056c33ef2fa87c7d5d334a5c2d3e489e34e2a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22EA6	56428 bytes

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