PDF malware analysis — malicious · 528d53d8b4e0b56f

MALICIOUS

PDF

8.1 KB Authoring application: P fijorop (via Ujikejdiclana)

MD5: 191180841c1e9b9e376753d3c49ea573 SHA-1: be83b18be31cf2ca2341d0d3a95b391dd6c26201 SHA-256: 528d53d8b4e0b56f788cc22f2f5fc1e81d59941e24f3cc0b5b75a60feef814f3

258 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that is obfuscated using eval() and unescape() calls. The critical heuristic CVE_2009_0927 indicates the use of the Collab.getIcon method to trigger this known vulnerability. The embedded JavaScript is likely designed to download and execute a second-stage payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-35649' and the presence of obfuscated JavaScript streams. The document body text appears to be unrelated filler content.

Heuristics 8

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. (identified after JavaScript deobfuscation)
ClamAV: Pdf.Exploit.Agent-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
OpenAction trigger high PDF_OPENACTION

PDF has an /OpenAction — code runs automatically when opened
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
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_obj0007_000.js` `71a93c08d1aa4a9ffd59006e076639e0442180af56d70eaa1a57edc31bb986d7`	pdf-javascript-stream	PDF /JS object 7 at offset 0x4E6	6393 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `e02e2a3bae5c73bf215cd72464cd0cd24899c02b4725be7065c7303db8f7b64c`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x4E6	276 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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