PDF malware analysis — malicious · c52cc50786d20ebc

MALICIOUS

PDF

2.3 KB

MD5: 689c20464f6bee2c914e72b2b6d196e0 SHA-1: 3b444ebe7d48b91b9dc8d59f0f0176973bc43c2f SHA-256: c52cc50786d20ebc1aafd9ef21d627767ec93e97b1b6d7f408d8435e24ae0b95

226 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1027 Obfuscated Files or Information

The PDF file contains obfuscated JavaScript that utilizes `eval()` and `unescape()` functions, along with `String.fromCharCode()`, to decode and execute malicious code. The critical heuristic `CVE_2009_0927` specifically identifies the use of `Collab.getIcon` to achieve code execution, a known vulnerability in older Adobe Reader versions. The embedded JavaScript streams, particularly `legacy_pdfkit_stage_000.js`, are indicative of a downloader or exploit loader. The file is detected by ClamAV as `Pdf.Exploit.Agent-36082`.

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-36082 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36082
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.
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_obj111611_000.js` `772da696bdb365f3f1eb4ea6af881baad391be62f3591b19f2f9827fcc4c9b53`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x847	479 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` `fd60bfe7f82686eeb97ced7d110a82d373a3e38f4c488758e9a531c3f8a09c2d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x189	2637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).

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