PDF malware analysis — malicious · 94261a9e3a4e49be

MALICIOUS

PDF

11.7 KB

MD5: 6b0876fcdaccee6cfee1d2d794438c10 SHA-1: fe273560d532ea5eaa060746b59ddf5c2f8de5f5 SHA-256: 94261a9e3a4e49bef72c4f11963af2b16bcfec9467fd5c260ff3a757344d7fa7

198 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains obfuscated JavaScript, identified by heuristics as a CVE-2007-5659 exploit targeting the Collab.collectEmailInfo function. This exploit acts as a stager, likely downloading and executing additional malicious code from embedded JavaScript files. The presence of these embedded JavaScript files and the exploit trigger strongly indicate a multi-stage attack designed to deliver a secondary payload.

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: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
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` `6f60a1053baafdc578f85eae84a2dc6d16775fbd66240d82cbfb7b4f4ff4e90a`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	295 bytes
`legacy_pdfkit_stage_000.js` `00afa52f7ee8578693148427715ca2242f8ee146388080f2cbcbf260688e3aa4`	deobfuscated-js	z-percent hex-pair decoded JavaScript at offset 0x2E9	4899 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_001.js` `6e010b9a2a757822db9a9b121b50a1f90aa657b3b7116ae8e2e7163dc5dbfd43`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2E9	11870 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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