PDF / .TXT malware analysis — malicious · d5ea98b6b8266e5b

MALICIOUS

PDF / .TXT

12.4 KB

MD5: 3e69061549795c45d344a4e6fd3b60c8 SHA-1: 9fdf1f1d940504da4366416c721d1529b10419ca SHA-256: d5ea98b6b8266e5bcfe59a03379b4f2a17a1f1565c7fa820c5c60bd0d5fb1a6b

138 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript and utilizes the 'Collab.collectEmailInfo' function, indicative of CVE-2007-5659 exploitation. The critical heuristics suggest a stager mechanism that decodes and evaluates JavaScript, likely to download and execute further stages from the extracted files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The overall purpose appears to be the execution of a malicious second-stage payload.

Heuristics 5

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.
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` `57a08d1088b0c5e10f079c5db10fc06bf0c92b5f1bb542aa958796052e24047e`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	11981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c3cafc1b02adac5a8f972ae3076da262628a842b2f11a923ab14d190ecd8cba0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	4939 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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