PDF malware analysis — malicious · 23c2b4af0fe56c41

MALICIOUS

PDF

17.4 KB Created: 2009-07-13 02:11:15 Authoring application: yDwoypLCK (via SZCMGbzZc4ttiJ)

MD5: 35cc42ca676da199a402a9667c8309dd SHA-1: ccb56808d1cbff0d31defbce51f8ae641fd9b80f SHA-256: 23c2b4af0fe56c419ca9d375fbcaa21514f05cdc103a8a8373f9d9fcdfc20db1

336 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that utilizes custom Base64 decoding and eval() calls to unpack and execute exploit code targeting Adobe Reader. Critical heuristics indicate the use of exploit kits for CVE-2007-5659 (Collab.collectEmailInfo) and CVE-2008-2992 (util.printf). The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack vector is the exploitation of known Adobe Reader vulnerabilities.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 9

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.
ClamAV: Js.Trojan.Obfus-48 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Js.Trojan.Obfus-48
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `c84823a6c3b56a46e862cde4890776696b70fdbdd8a601d5ed34e7f1875f2f68`	pdf-javascript-stream	PDF /JS object 7 at offset 0x241	16504 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`stream_000_off0000008a.bin` `33f21905f087e89a54d69e3e99e9ceef24201b8186375c535c1c62162f14faeb`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8A	84 bytes
`custom_b64_stage_000.js` `2d057c1e743288cbf375d044e2e466188153530f12074dfba6b0637dcd5b9f21`	deobfuscated-js	custom Base64 decoded JavaScript layer 3 (PDF /JS object 7) at offset 0x11DA	4584 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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