PDF malware analysis — malicious · 238f4d57f04c1b52

MALICIOUS

PDF

11.8 KB

MD5: 781113504c448ec35c435f4fbdc2a523 SHA-1: f4265291e8c2535ef6dc72377e548fcc97019510 SHA-256: 238f4d57f04c1b52f0ea784fe35912410e960cf9bf4d982e3336439128397b34

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. Critical heuristics like 'PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER' and 'CVE_2007_5659' point to the exploitation of a known PDF vulnerability (CVE-2007-5659) using a JavaScript stager. The ClamAV detection 'Pdf.Exploit.Agent-36065' further confirms its malicious nature. The presence of deobfuscated JavaScript files ('legacy_pdfkit_stage_000.js', 'legacy_pdfkit_stage_001.js') suggests the script is designed to download and execute a second-stage payload.

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-36065 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36065
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` `9c67560e8c63b720885d3efc1627b844b86a6ec08e99e5b65a22eae832045756`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19C	431 bytes
`legacy_pdfkit_stage_000.js` `9201a95836d6186e904e2507209f8834ae06e1ef938fd6379d2ce17f427b07d4`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12072 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `e995f2d9a5721d7881dc15646f791efab649cc4e25a4348b3c19ab898b988ddd`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4987 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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