PDF / .TXT malware analysis — malicious · 9073c0bbb30479ed

MALICIOUS

PDF / .TXT

12.1 KB

MD5: 2f19eb6aa2d08fbcd108f04f93d5030c SHA-1: 5fd7c26328cf25faa2fa318edebe73251865583c SHA-256: 9073c0bbb30479ed412e04177a483c46712e0b930457d99388fe5de6a877a661

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. This JavaScript is designed to download and execute a second-stage payload, as indicated by the presence of deobfuscated JavaScript files `legacy_pdfkit_stage_000.js` and `legacy_pdfkit_stage_001.js`. The ClamAV detection `Pdf.Exploit.Agent-35903` further confirms its malicious nature. The attack pattern involves luring the user into opening a malicious PDF that triggers an exploit.

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` `74310a65bd45fbcdc9d8f9a8574b1c877f194605aff9cc28f10c64a8f366ee3c`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E8	5119 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` `25bccceab701541c37219d9c35cc541d991e41e634285bff127e764331bd6cbc`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E8	12265 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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