PDF / .TXT malware analysis — malicious · 9a84f91870cf3f63

MALICIOUS

PDF / .TXT

12.9 KB

MD5: 2db038a1a3558fc86132fd59a854a705 SHA-1: d812952f735f59a85ae29fb077ddb672bcd5b84f SHA-256: 9a84f91870cf3f6364538161889126b6a8b6cf58259e72cb62f59cc2ec6d2f77

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, identified by the PDF_JAVASCRIPT and PDF_JS heuristics. The critical CVE-2007-5659 heuristic indicates the exploitation of a known PDF vulnerability using the Collab.collectEmailInfo method to execute JavaScript. This script is likely designed to download and execute a second-stage payload, as suggested by the suspicious extracted artifacts named legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The document body was unreadable, but the presence of exploit-related heuristics and embedded scripts strongly suggests a malicious intent.

Heuristics 4

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)
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.
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` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `2f23d7fade690dc2951c70a05dc41d68aeb879a30041bed7ff4c61d469c4a940`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12591 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `fd1b3435eaa3fcf8125f2d9d95e020b94d7d16e9185d5fe565adb06dbaf097f8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5204 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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