PDF malware analysis — malicious · c819feef26f1958f

MALICIOUS

PDF

12.4 KB

MD5: 62a5c6999b0d97ca5e34eb17e219bfb7 SHA-1: a747120438b8392329aff6b87d69254e17d063e4 SHA-256: c819feef26f1958f3237563e939610ab5d38da215c58232ae0c68bad4f8b99b5

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/Shell Script Execution T1204.001 Malicious Link/URL: Malicious Link T1071.001 Web Protocols: Web Protocols

This PDF file contains embedded JavaScript, identified by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. Critical heuristics indicate the use of CVE-2007-5659 (Collab.collectEmailInfo) and an eval stager within the annotation subject, suggesting an exploit designed to execute arbitrary code. The presence of deobfuscated JavaScript files further supports the conclusion that this sample is a downloader or initial stage of a multi-stage attack.

Heuristics 7

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-36062 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36062
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser exited 1. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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` `068944f8c011a88ab770b45c6de142b9305a1f515d410204d5eadd9ac2b5bfb3`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19B	373 bytes
`legacy_pdfkit_stage_000.js` `c56abff3f18a581146e498b7274b0d1c41650b066b2716ed4f7cf8321b07e624`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	12442 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `ba0316a627270bd6435b72134032eea7ab6b733e358656c6c0697bc64f05f0c0`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F5	5148 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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