PDF malware analysis — malicious · 783a6934a1c12c31

MALICIOUS

PDF

116.4 KB Created: 2009-07-29 09:08:53 +08:00 Authoring application: WPS Office 个人版 (via PDFlib 7.0.3 (C++/Win32))

MD5: 2366453ee94a7ba4d296fa4e710ed805 SHA-1: 082f8af5658dd2c6f2be325a91d982ebbb24f55e SHA-256: 783a6934a1c12c31f874f8246aa44c07d010480546bcb263fb3f090337a6874a

336 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that utilizes unescape() and String.fromCharCode() for obfuscation, a common technique for malicious scripts. Critical heuristics indicate exploitation of CVE-2009-0927 (Collab.getIcon), and ClamAV detections confirm it is a PDF dropper. The embedded JavaScript is highly likely to download and execute a secondary payload, as suggested by the exploit cluster and dropper classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 9

Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927

PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution. (matched in decompressed stream)
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
ClamAV: Pdf.Dropper.Agent-5303132-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-5303132-0
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.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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)
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_obj0029_000.js` `f254da164e9b164ee2aa3ec290268ae9ce75afac618daa9b3c017ab5aa1beaa7`	pdf-javascript-stream	PDF /JS object 29 at offset 0x1C346	6268 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`font_00_sfnt_off00000a82.bin` `7a4b69cdf7e60403689092ac272be4ca59a66aa5c37aa89f7781b389d981bd8d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA82	202952 bytes
`font_01_sfnt_off00008e6a.bin` `0936461790959a8a07650c8f012878814262935f11c8ec9ca55ae94f9e1ebf76`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E6A	21688 bytes

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