PDF malware analysis — malicious · c186375b5865b17a

MALICIOUS

PDF

27.9 KB Created: 2009-04-06 06:06:20 Authoring application: pPhiHBSmWqjOB (via bocpfT)

MD5: dfd5dc85e51877b5a4876c3ef8681b1f SHA-1: 907837c9b4351cf5399088a12007723bd49c3970 SHA-256: c186375b5865b17adc749c8279e5bc9008b642820bac7ca70f64c2a969527b52

278 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file contains embedded JavaScript that is heavily obfuscated and utilizes techniques like numeric array division and `eval()` to hide its malicious intent. The heuristics indicate that this JavaScript is designed to exploit known vulnerabilities in Adobe Reader, specifically CVE-2007-5659 and CVE-2008-2992. The primary goal appears to be the execution of a second-stage exploit payload, likely leading to further compromise.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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)
util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992

PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (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.
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (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.
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` `902ed7f7ce15d2b147d2d91395f39b1ecac19f59db630e48882ed689ca0a691a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x237	27327 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`numeric_array_division_stage_000.js` `fc9cf23ae00c8fcff83373d9dbacb4fa5b125dbf08115b6d5edfe953bf01c9d6`	deobfuscated-js	numeric array division decoded JavaScript at offset 0x268	5410 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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