PDF malware analysis — malicious · 4624292d1c97c192

MALICIOUS

PDF

6.0 KB Created: 2008-09-24 19:47:56 Authoring application: Adobe

MD5: 1a5d323855dc22688e4c94770b768978 SHA-1: 685abffef943340c484224c3c328d272015195f0 SHA-256: 4624292d1c97c1923bfec5cfd4da773f3683ca082a3ecd46bb7e8fb8e23aa234

348 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains multiple critical heuristic firings indicating it exploits known Adobe Reader vulnerabilities (CVE-2007-5659 and CVE-2009-0927) via embedded JavaScript. The ML classifier and ClamAV detection strongly support its malicious nature, identifying it as a dropper. The deobfuscated JavaScript, legacy_pdfkit_stage_000.js, likely downloads and executes a second-stage payload, though its exact actions are obscured. The extracted ClamAV detection name 'Js.Exploit.Shellcode-18' further confirms the presence of exploit shellcode.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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)
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.Dropper.Agent-1828721 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-1828721
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `b18cc461e4f208aac8ff1201e2cbcab473ba581cf02fda3a6f0a6d48abf97ac1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13BE	151 bytes
`javascript_obj0016_001.js` `f2a9ff8f6ead8e47036a80e5ffc96ed9234778f13e4a626a5d0cab8d5a50f362`	pdf-javascript-stream	PDF /JS object 16 at offset 0x149B	200 bytes
`legacy_pdfkit_stage_000.js` `f7e03421c1cf3077b7407895f0f896a042e1b187dbc74426aecfb232ac527b48`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1E7	4913 bytes
Detection ClamAV: Js.Exploit.Shellcode-18 Obfuscation or payload: likely Carved artifact contains 9 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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