PDF malware analysis — malicious · 132ef55fe168b181

MALICIOUS

PDF

10.2 KB

MD5: 3132a0593d68db18263fdb6992e20853 SHA-1: 5bec49927b1f516a37d5061f3a006e9680f00427 SHA-256: 132ef55fe168b18127f385a4c90123ed3d9f3ea06c1f0bc0093a0acb42b01d7d

328 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The sample is a PDF file that contains embedded JavaScript. The JavaScript is heavily obfuscated using variable concatenation and the `unescape()` function, a common technique for evading static analysis. Multiple critical heuristics indicate that this JavaScript exploits known Adobe Reader vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992) to achieve code execution. The primary intent of the script is to exploit these vulnerabilities, likely to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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)
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.
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_obj0007_000.js` `f110861ad62a5cb1bcedc69a566a0ff83b8bd118dc885e8b12e198cee4fb5e70`	pdf-javascript-stream	PDF /JS object 7 at offset 0x233	46420 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 223 eval/decoder/string-building token(s).
`unescape_var_concat_stage_000.js` `8420ef4f069e5888286d2e6ac2685059a99bdeba538d8fbe4b49fda36b1996c6`	deobfuscated-js	unescape variable-concat decoded JavaScript (decompressed) at offset 0x284	6688 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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