PDF malware analysis — malicious · 7c61daee61003865

MALICIOUS

PDF

2.0 KB

MD5: f09bb8984d8a81f37d77a01c3135fd6a SHA-1: fe1912393a2557f5806e9d25306bec68fdf16b15 SHA-256: 7c61daee61003865651de1617ce7f4a639171dceb5c5364f0faccc322b3233a9

388 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded JavaScript streams that exploit known Adobe Reader vulnerabilities, including CVE-2009-0927 (Collab.getIcon) and CVE-2008-2992 (util.printf). The JavaScript code, after deobfuscation, appears to be designed to download and execute a second-stage payload from a remote URL, indicated by the reconstructed string 'http://www.example.com/evil.exe'. This exploit kit functionality strongly suggests a malicious intent to compromise the user's system.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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)
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. (matched in decompressed stream)
Pidief-style multi-CVE JavaScript dispatcher critical CVE likely PDF_PIDIEF_MULTI_CVE_DISPATCH

A single JavaScript body branches on app.viewerVersion and invokes two or more of the canonical Reader sinks (Collab.collectEmailInfo, Collab.getIcon, util.printf with a field-width format string). This is the 2009-2010 Pidief.J multi-exploit landing template: a per-version dispatcher that fires the matching CVE chain for whichever Reader version opens the file.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj263984_000.js` `b8ff9fe0a257f29acd31630ae5107da8057e5f086f16ab5f92ee1340905ecaa5`	pdf-javascript-stream	PDF /JS object 263984 at offset 0x197	2272 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`javascript_obj263985_001.js` `205e7e75e9a594e501d7828f0382b918630914047c05d0570ed7649b1911829f`	pdf-javascript-stream	PDF /JS object 263985 at offset 0x5A2	152 bytes
`javascript_obj263986_002.js` `dd567a8c0aee9ea0e1d43fe2e9cac5d8cb14cab59e7dad9bfe750b08dafb20cb`	pdf-javascript-stream	PDF /JS object 263986 at offset 0x672	518 bytes
`combined_document_js_000.js` `7792ac584833a1ba3742d45336a99339641c712680808867d47d4c35dafd52d4`	deobfuscated-js	combined document JavaScript streams at offset 0x197	2944 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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