PDF malware analysis — malicious · 39a86a20789ff4a7

MALICIOUS

PDF

11.7 KB

MD5: 49eb31a162f3976f5693a2da955bb1bb SHA-1: 797567a4d506daa23fdf3e58eea60ccc1f463d72 SHA-256: 39a86a20789ff4a7c1c647b19c1ccccb6e69168d9ab205ecf97250fd91e4ecc0

146 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript that exploits CVE-2007-5659 via the `collab.collectEmailInfo` function. Static analysis recovered two deobfuscated JavaScript files, `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`, indicating a multi-stage download and execution process. The ClamAV detection `Pdf.Exploit.Agent-35903` further confirms its malicious nature. The exact payload and destination are not 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` `7b728ef110e6df61b2d8a3f63fbe7ad662bda5e274933ab726dd01a74c3fddac`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	4956 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` `2ee3fcb8b29c5411035c12d850f6e5ab3202294ad58bf53fe64623f67f0ece70`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11779 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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