PDF malware analysis — malicious · 4dc7384c8a1c605a

MALICIOUS

PDF

12.5 KB

MD5: 3b6961d99b036c9c7b6f684d6d91e809 SHA-1: 2868371fe71ac634bfe9eeb0762a32225764f6a1 SHA-256: 4dc7384c8a1c605a1ab56782c56f08454ba238886c339e04cb26fdf2b82fc0f5

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains multiple heuristics indicating JavaScript execution and exploitation of CVE-2007-5659. Specifically, the 'Collab.collectEmailInfo' method is used with hex-decoded JavaScript, which is then evaluated. This process likely leads to the execution of the embedded JavaScript streams, which are identified as 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. These scripts are responsible for downloading and executing a second-stage payload.

Heuristics 5

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.
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` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `8575b8e8f2ada3b69deb6a0e6ce5f2f391bf391f486087c27e54f9b1593bfd93`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `63eecf4957a84f7273a2f0309c84937ffa41c61824de04f69266149c26d6eaf8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5095 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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