PDF malware analysis — malicious · 2a545470a0841b40

MALICIOUS

PDF

5.5 KB Created: 2009-10-05 22:59:14 Authoring application: Scribus 1.3.5svn (via Scribus PDF Library 1.3.5svn)

MD5: 3094558df494270764dc06545ca85064 SHA-1: d520cd8d9b1131101226ee4ffd453f99368efc27 SHA-256: 2a545470a0841b401151420836b05051d62bf6c3a9fc207d50feb056fca7c0ed

396 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1204.002 Malicious File

This PDF file is flagged as malicious by multiple engines, including ClamAV, and exhibits critical heuristic firings related to Adobe Reader exploits. Specifically, it utilizes obfuscated JavaScript that leverages CVE-2009-0927 (Collab.getIcon) and CVE-2007-5659 (Collab.collectEmailInfo) to execute arbitrary code. The JavaScript is heavily obfuscated using unescape, charCodeAt, and XOR operations, indicating an attempt to evade detection. The primary function of the script appears to be exploiting these vulnerabilities to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 10

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)
Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
Multi-CVE Adobe Reader JavaScript exploit kit critical PDF_ADOBE_READER_MULTI_CVE_JS_KIT

One recovered JavaScript stage contains multiple version-gated Adobe Reader exploit branches. This is stronger evidence than independent API keywords: the PDF is selecting old Reader vulnerabilities by viewer version and running heap-sprayed Acrobat JavaScript exploit paths.
ClamAV: Pdf.Exploit.Agent-1681 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-1681
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0016_001.js` `ef4267eecec3d3b64e35c93f31a1ba9d91d9a5e42d18b7aacfd613a35266525f`	pdf-javascript-stream	PDF /JS object 16 at offset 0x75B	11915 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `edba4f23571899baafe026095a7ca13a6f795637afb340783e90f7db652cf243`	deobfuscated-js	unescape charCodeAt XOR decoded JavaScript at offset 0x75B	6586 bytes
Detection ClamAV: Pdf.Exploit.Agent-35646 Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).

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