PDF malware analysis — malicious · 39cc8f7a6fe05ba2

MALICIOUS

PDF

3.5 KB

MD5: 8b7b7c440cdc44b62684d6760ed8ac10 SHA-1: 77f76d4fb5ef2ff9d0715d58d4e02636106a548c SHA-256: 39cc8f7a6fe05ba2d020f43bcbbe5677fbd590e94ae723027f807931bfd23474

278 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. Critical detections for CVE-2009-0927 and CVE-2007-5659 confirm the exploitation of known vulnerabilities in Adobe Reader. The embedded JavaScript, particularly the 'numeric_charcode_stage_000.js' file, is designed to be executed, likely to download and run a second-stage payload. The document body is heavily corrupted, providing no further context.

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)
ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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_obj0004_000.js` `a9f11751030e14533e294fb6392948c2c3f37718856bf9a0243ecb5b47ef3cdf`	pdf-javascript-stream	PDF /JS object 4 at offset 0x249	29657 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`numeric_charcode_stage_000.js` `12967459c3f43a15f5431eb4f513776707d0a588760627c8b0075ebc612fd979`	deobfuscated-js	numeric char-code string decoded JavaScript at offset 0x2B2	6677 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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