PDF / .TXT malware analysis — malicious · fba0e227e0e2aadc

MALICIOUS

PDF / .TXT

12.8 KB

MD5: 433fb34e69e242122a0daa8ee8b83124 SHA-1: 97fd42fe759d0933fa46a4d85801018c97b5c178 SHA-256: fba0e227e0e2aadce625bcc7405aa71f040b25643ce73c34bf54a3f2778c8b31

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.001 Malicious Link/Object

This PDF file contains embedded JavaScript that leverages CVE-2007-5659 (Collab.collectEmailInfo) to execute a stager. The stager is designed to decode and evaluate JavaScript, as indicated by the 'eval stager' heuristic and the presence of deobfuscated JavaScript files. The primary function appears to be downloading and executing a secondary payload, 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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
ClamAV: Pdf.Exploit.Agent-36064 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36064
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` `a5c8f0f722df4dd9876a0087e1eee65bd3020c5995f94f6729f7e17f3f3677a0`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	331 bytes
`legacy_pdfkit_stage_000.js` `eae08b4196588122810e389572ea4aef661edebecff7cf0face6cd432e0a584a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	11993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `6670b059bc1a07d52d245b0bf5b996c47b5e4af55eda1b886659ce1480f5efc0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	4970 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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