PDF malware analysis — malicious · f6208505960d7c28

MALICIOUS

PDF

13.0 KB

MD5: 7bfd3fc75a47cc7e6e0d4fa7a2bc4828 SHA-1: 7e955dde05c03f51a74191f0f24dafbc64cde3bb SHA-256: f6208505960d7c2868b7413a67020082f8b901ae50a19be1ebe77ad5bc96216c

198 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. Specifically, the CVE_2007_5659 heuristic indicates the use of Collab.collectEmailInfo with hex-decoded JavaScript, which is then evaluated. This stager is designed to download and execute a second-stage payload, as evidenced by the extracted JavaScript files legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js. The CLAMAV_DETECTION heuristic further confirms its malicious nature.

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` `01f5b45c8b4531ece1651095dd474d33b2018508bfe849059260e23bb2852fb0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12099 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `d78a2dccb78981e3a1094332f83f50faa2e3b8a19f0de679a786b07ee2b2ec8d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5092 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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