PDF malware analysis — malicious · f312fb9c987d6f89

MALICIOUS

PDF

11.8 KB

MD5: 55b578d353fcabf83f5e93407c91b83f SHA-1: 9ca4924779b493bb9555d2faa2f730f1b698c2ec SHA-256: f312fb9c987d6f89150597ea4d3485e91b8d469f85cd2acf38b74fbd2dba94e4

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, identified by multiple heuristics, including specific detection for CVE-2007-5659 related to the Collab.collectEmailInfo function. The extracted JavaScript files, legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, are indicative of a multi-stage exploit. The primary function of these scripts appears to be downloading and executing further malicious content, a common technique for initial access and payload delivery. The presence of these deobfuscated JavaScript stages strongly suggests an exploit attempt.

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` `3dbfcdacafe0798a9c2dfca64663e3a860d64316b709685a1523f1fba842a144`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5065 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` `dda350db085b8a99ef73167e42e3ddd0b9c47ae96c7f91b0d91d4df79bf9a5c4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12110 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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