PDF malware analysis — malicious · 9e7529a3f1ce53be

MALICIOUS

PDF

11.4 KB

MD5: 8f2b9810e46f9aa7a09eed8b7e3da075 SHA-1: 54d28bd6f3dc274e095711107308125b6e6a0502 SHA-256: 9e7529a3f1ce53bee169af3ab5264b4a115d355756bf7fbe94228bccc076ee21

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability through the 'collab.collectEmailInfo' function. This JavaScript is further deobfuscated into two stages, 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The primary function of this script appears to be downloading and executing a secondary payload, indicated by the heuristic 'ClamAV: Pdf.Exploit.Agent-35903'. The presence of multiple deobfuscated JavaScript files suggests a multi-stage attack. The attack pattern is consistent with exploiting PDF reader vulnerabilities to deliver further malware.

Heuristics 6

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: Pdf.Exploit.Agent-35903 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35903
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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` `860eae5f96eb426380281c575a089242b50523bbb4bbb8dd765e582cd9c07d2e`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	294 bytes
`legacy_pdfkit_stage_000.js` `a86df36251f49a32eaf220f64a7bbee2848956056ef571e4e2f8d5632d450c5f`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	4942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `6cf533d8f5a190d64200f248d39522372325236cc51da43f1513ceca0baf6f05`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11813 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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