PDF malware analysis — malicious · 71ddf09bc1e7e220

MALICIOUS

PDF

7.8 KB Created: 2009-06-29 17:25:31 Authoring application: Fahofecitimorirani

MD5: 03eaf3b98e7a2bf8030f370a17fc71d8 SHA-1: 7990d15181c4e153e0e035a5910e5ddba6114977 SHA-256: 71ddf09bc1e7e220ef6ce955dc794c60ca78f1b55b26644bd2b52199014e0df8

468 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains heavily obfuscated JavaScript that exploits multiple known Adobe Reader vulnerabilities (CVE-2009-0927, CVE-2007-5659, CVE-2008-2992). The script is designed to download and execute a second-stage payload, indicating a typical exploit kit dropper functionality. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 11

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)
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.
ClamAV: Pdf.Exploit.Agent-35649 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35649
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)
Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY

Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
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 7

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `d1e7e303a4803469785c1316c28302cc08af07cb7fd3390790512c4b21d28ad6`	pdf-javascript-stream	PDF /JS object 7 at offset 0x345	6485 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s).
`generic_stage_recovery_000.js` `fc6efc64093d329f6df6146b3ae661fed5e7efa5c02f0c19a118e08236f4a2b3`	deobfuscated-js	generic stage recovery split-literal-normalize from JavaScript object 7 at offset 0x345	6245 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_001.js` `20c3ab94ce16dabe6c31662eddd5bdaf0b52cb856e6d76a12680089a70b081b4`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x1119 at offset 0x1119	2754 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_002.js` `b13f82e4b8773eac36a5c8766234d0996764bf2a100a7df3dc66cd282ae10a57`	deobfuscated-js	generic stage recovery split-literal-normalize from decompressed stream at 0x1119 at offset 0x1119	2729 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_003.js` `c2750af02fb56a523a481936836017e5a12a5cb9e277382415a84c807ef7ef00`	deobfuscated-js	generic stage recovery split-literal-normalize -> percent-decode from JavaScript object 7 at offset 0x345	6241 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`generic_stage_recovery_004.js` `c77b54a234c1eeae32217395da8cdefa38c69cad054d588b690360210079dc50`	deobfuscated-js	generic stage recovery percent-decode -> split-literal-normalize from JavaScript object 7 at offset 0x345	6243 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 11 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_000.js` `48f7a9c25b866023f2abe8fcb0dadbb108fd166c84b44ca37df3e044dea655e4`	deobfuscated-js	string-concatenation normalized Acrobat API aliases at offset 0x345	560 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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