PDF malware analysis — malicious · 4755ea2d769d4310

MALICIOUS

PDF

11.9 KB

MD5: d3ec3a1e562abff75ffa18c8e1b22438 SHA-1: 5f4f15ce3ccb613c23d03163775cdb6a4bbc48cf SHA-256: 4755ea2d769d4310711c0772d0c7840dc57cd973bc8d3e1926838a1e2c12cd68

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, specifically targeting the Collab.collectEmailInfo function. Static analysis recovered deobfuscated JavaScript streams, indicating the script's purpose is to download and execute further stages. The presence of 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' suggests a multi-stage attack chain typical of exploit kits.

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` `22306ced0fe406459285f841e057f7ad1c16a5f4918d6a0adc4cdb8fbc8fbb59`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5034 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` `e2e2ccf9d1829ce3a3bec3bdb3dc642b201f64889bf838f7d31f643e8113ef20`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	11942 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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