PDF malware analysis — malicious · 87c2951f25cc91e5

MALICIOUS

PDF

13.1 KB

MD5: 6cd9d9e9c867123a6e5f5e497b0d89de SHA-1: 7d32e45f381b428ae346e09719b71fe88e879541 SHA-256: 87c2951f25cc91e57bb85cc0ca637d10dd2ef51f1b28b077704c242c343f9fb6

198 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, triggered by the CVE-2007-5659 exploit targeting the 'collab.collectEmailInfo' method. This JavaScript is further obfuscated and staged into multiple files, indicating a downloader or stager designed to execute further malicious code. The presence of multiple deobfuscated JavaScript files suggests a complex multi-stage attack. The ClamAV detection 'Pdf.Exploit.Agent-36064' 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` `29aea398318102a901c426a8cbf30b5f627d1f21696b9a7e2f6ebd2155ccc72b`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12292 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `3488d9ce0a57ea495b91cd42879359779ba0869b036248ffde3f6bd7e2ccc17a`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	5113 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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