PDF malware analysis — malicious · 4e83f50aacb6e79f

MALICIOUS

PDF

11.6 KB

MD5: e6bc6ae65f0fb206688a42a7aade3733 SHA-1: a7f21b78b5810d8dd96df721a2b3fd6b122cf28f SHA-256: 4e83f50aacb6e79fcef82586811812e8ef2a1ada38bdaaf2dacfbfcee2b8f6d7

146 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.001 PowerShell

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, specifically targeting the Collab.collectEmailInfo function. The heuristics indicate that this JavaScript is used to download and execute further stages, as evidenced by the extracted JavaScript files legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The ClamAV detection of 'Pdf.Exploit.Agent-35903' further confirms its malicious nature. The exact payload and ultimate goal are not fully discernible from the provided evidence, but the exploit chain is clear.

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` `4ec047de4d330f7d240acb2ac3f293e1b456743c8c9d6f34c5e3780b2f914676`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	4853 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` `8a3aaeff16b32e1ad3af17af15d102e2d30bdca47169af34136512e8109ac903`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11757 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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