PDF malware analysis — malicious · a529715ba2ede3be

MALICIOUS

PDF

13.0 KB

MD5: 5eacfa9b463b657b188a240890d9f29b SHA-1: 1f2a695c183734a9b2b0ec48e9c4eed7287ef55f SHA-256: a529715ba2ede3be286ea6043f34558b43bb7ac7d13aba85b1509880c3889b13

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

The PDF file contains embedded JavaScript and exploits CVE-2007-5659 using the Collab.collectEmailInfo method. The embedded JavaScript, found in legacy_pdfkit_stage_000.js and legacy_pdfkit_stage_001.js, is designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36064' further supports the malicious nature of this file.

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` `f9c5421edba5c2ed692747b1623ea5ef72452a85c96a12c5ee90baabb552dc61`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	12226 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `0313971b4a8e94a2c63562c64faac7eee6114dffdd6c84839c3dbfcad23a4dbb`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F2	4994 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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