PDF malware analysis — malicious · 522faa9e128aa6bb

MALICIOUS

PDF

12.9 KB

MD5: 67ea9969791acf5cf4ab033933f11a30 SHA-1: 7242c2c92e7377114fe3afea190eec40cec7534a SHA-256: 522faa9e128aa6bb6a834d1ee12a31935b6e1d479eb81a946f67330aaec55189

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute a stager. This stager is designed to download and execute a second-stage payload, as indicated by the ClamAV detection 'Pdf.Dropper.Agent-7212752-0' and the presence of deobfuscated JavaScript files. The exact download URL and final payload are not directly extractable from the provided evidence.

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.Dropper.Agent-7212752-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7212752-0
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` `59e15e7a131549e59fcaa7bcc55c28926bb3e8bb91e13befe85053e0f71e8f79`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12627 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `793644b9e59b826cb469e76499802db603e1dc332945ecfd42cf79ba046f8879`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5285 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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