PDF malware analysis — malicious · 9dcf9f3a8f375fc4

MALICIOUS

PDF

11.7 KB

MD5: 8a07b1e52b63061da317e1f2de4e3685 SHA-1: ea1155d281afeb2ea74e2ef2c5c40c5545a02373 SHA-256: 9dcf9f3a8f375fc49d62227914400640805b2995b531001303f79f1498da3bc8

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript that is obfuscated and uses a stager technique involving percent-encoding and eval. Heuristics indicate the exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method, which is a known method for executing arbitrary code within Adobe Reader. The embedded artifacts 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js' are likely components of the exploit chain, suggesting the file's purpose is to download and execute a secondary payload. The ClamAV detection further supports its malicious nature.

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` `5a3c7888c0c3363fd490a7dd5fa7a28b27da5f93cc9dd866f10e9a7797e6fc7f`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	12020 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `2a94a832fbcff8e24e68bd54d01805c23ef423509b7e3999d743987288db78d9`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x315	4962 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.